Malicious PDF — malware analysis report

Static analysis result for SHA-256 785c7b2ce9f415f7…

MALICIOUS

PDF

105.4 KB Created: 2021-03-11 04:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a4e4095a2df30775b723736c7572e16 SHA-1: 9e336387a286697c6be42f3767015ac8d6d6fb4f SHA-256: 785c7b2ce9f415f79d2f32920aa1c82f0f0828d009bb8bdbbce3a531d7fcb8b2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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.
  • 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=seeding+theory+of+calculus+formation PDF link annotation
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/warejizo.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/bosch_vision_300_series_washer_manual.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/xebosevifebejiwava.pdfIn PDF document text
    • http://loxapul.iblogger.org/rufona.pdfIn PDF document text
    • http://wusodopepufex.66ghz.com/ketav.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/fRhcpCX/natural_scenery_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/hieJ2yM/roblox_studio_login_problem.pdfIn PDF document text
    • http://zaketim.22web.org/aclaramiento_de_creatinina.pdfIn PDF document text
    • http://sofarabexuki.iblogger.org/streaming_platforms_market_share.pdfIn PDF document text
    • https://pukutititoj.weebly.com/uploads/1/3/1/3/131383613/gabevimesozujil.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/4486485.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/wedoteno-visinipe.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/dDiaijX/30751469377.pdfIn PDF document text
    • https://cdn.sqhk.co/wemojezuvegi/0EhaggV/navef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_b6199221262e407aad13eea1cc7e44c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tenunud/consumer_reports_air_purifier.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/bermuda_triangle_book_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/lapexiwevumezakapuraxo.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/login_page_html_bootstrap_template.pdfIn PDF document text
    • http://noderukun.epizy.com/48939143055.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_0bafe1ac69404f01874bf85901d9e25e.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_297b38b5ca814bc4a0d53c0f5a501b15.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_c79e6eada3394acdb7349b48823f006e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4F 5640 bytes
SHA-256: ec81bb72ef5460b0fde7cca90ebd975654146dcf5177df9880707cb14902ec0f
font_01_sfnt_off00017264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17264 11008 bytes
SHA-256: d20d2220ad30b67519c1f779e726d2ae52ce077a50969549731560a58fc95fc1

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