Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e25d1484581d71b…

MALICIOUS

PDF

133.4 KB Created: 2021-04-27 20:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b8cdc9406a3418893d1bc3128a886afd SHA-1: 5206a9231ddfc3fbe307307c369b55b060cd4257 SHA-256: 6e25d1484581d71b2c104d938e66be0c1040c3c4425d4c50106dec9275fbf4a2
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically by presenting a fake CAPTCHA or human verification prompt to trick users into interacting with malicious links. The presence of a link farm and multiple external URIs, including one pointing to 'seumenha.ru', suggests an attempt to redirect users to potentially malicious content or download further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/strik?utm_term=gta+5+cheats+ps4+unlimited+money+single+player PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382790/normal_60329e1ed6097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487927/normal_5ff02b58f0310.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/hindu_baby_names_in_kannada_language.pdfIn PDF document text
    • https://pebuzifidam.weebly.com/uploads/1/3/2/8/132815752/jenumarowozasus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473403/normal_60680063a49b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_602adee088dd9.pdfIn PDF document text
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/lexoluwizavabi.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/4349937.pdfIn PDF document text
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/muzamorumixos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_b37105fce1414c23a6ca42d6acbe2f1e.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_4150844729a944ecbaa5e683be01e9d7.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_4f0a7357732e469f92bfc7990e20d6f0.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_5ebe9ac989cd40e4b9503751d4269eea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc805d6-5ae7-4122-8a7d-7cf29567597e/creating_a_flowchart_in_word_or_excel.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_9ac491122c0442109d9d326fe844ccb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24c4ead-f365-4c78-ab3c-a105229da967/how_to_replace_bearing_on_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71d178d4-2be2-4787-8457-dd5058489fd2/zomifabuziravimube.pdfIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_95dbf75ee5bf45a082e3d77339ed3a05.pdf?index=trueIn PDF document text
    • http://bitenozof.atwebpages.com/premiere_pro_transitions_free.pdfIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_2014319e1f2c467abaf6d9c409d649b3.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_2539b5a5fd094da0a02f0ad0ca4b97a3.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18711 3408 bytes
SHA-256: 389d1f0e2cf0a62f82fc1d8117eecc2425c8b6cd4a71d7435eee83302a13e3fa
font_01_sfnt_off00019341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19341 5716 bytes
SHA-256: 4acd50ed90b6b1fa8efb63c6f2bd016b82614d3d384f15071749c05af7e15f43
font_02_sfnt_off0001a688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A688 3288 bytes
SHA-256: 2a06ed2c6a241251007007a6893a92f2606f7451cd9e9a864c9adbb079c69766
font_03_sfnt_off0001b3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3D7 13776 bytes
SHA-256: 169e091ca0ab0a35982f88a8e83a52d74d6aae5f634810d5181aeb24bc48712d
font_04_sfnt_off0001e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E23C 16256 bytes
SHA-256: edb17cb0e1644fa3db1f7d2c74fee0db71b23d36abaf15fb446b9efdc21c8819
font_05_sfnt_off0001f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7B8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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