Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fda27133cc1b21…

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 06:23:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4a32e20c19cb7b42665c93d8da44d12a SHA-1: a3791fc413a2dbc5418709946caf68f7aefd4a99 SHA-256: c0fda27133cc1b21825fea0c1da0676f875229b98f88d3a69f04f2f6512bc8d2
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic or host malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://golowaki.ru/123?utm_term=mehndi+designs+videos++please PDF link annotation
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/8c1eacf25f79.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/vaxujoze.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://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_d59f2aa5770845dca26fdf2a0a766ffe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b208f7e-4bd0-4319-a5f2-fe4e0dd3053a/hermosas_criaturas_pelicula_completa_en_espaol_latino_online.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_a26d0e0620e447a08443466ae91d9678.pdf?index=trueIn PDF document text
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_cf2f357b758d4e1bbc698b0d692a0597.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/assassin_s_creed_odyssey_prima_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62ddc60-65cc-4468-8d82-ba9646b91c35/zixiwizafizize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d69d75a-c76f-4e87-a769-e0bb6911e044/what_is_the_most_effective_reading_strategy.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_6463af3f1afb411eb288af6d7128d4ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/mobile_anime_website_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/61134212080.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_eebd3beb243a41da97810c9f88087b0b.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_bbeca9b9cff04440858ab6f267e7b305.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_b6be550fda044464aeba49f864175614.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f606ec46-c890-4fa3-bf6f-276c2bca0a72/demosivirewanevetivosugug.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_4c97191896b747c282cffa0419a20e5e.pdf?index=trueIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_80fb6aa97e2c41b8b6d491ee4e35df4c.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_f9585895902243b0b560b15fc8dac129.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a38b23-09b1-47e9-9d94-e453325d3fd9/how_do_you_restore_an_iphone_without_a_computer.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 4896 bytes
SHA-256: ef30e19826ea76bc88d08f6c3186fa757f43552fa9f213c444e2ab8d262b023b
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10608 bytes
SHA-256: ba09a16c5005b3223fa3e9075f54d9bca2c22d5c4f74431e09ba59caf4b27c59
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71