Malicious PDF — malware analysis report

Static analysis result for SHA-256 422d77cdb6aed349…

MALICIOUS

PDF

75.0 KB Created: 2021-05-06 13:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: faf7cd325dfd954582496d0aeafb48cd SHA-1: 906ca3d90ebe2d88683affa286f6e543232e4c37 SHA-256: 422d77cdb6aed349a5a238b556f0c23d63bfab0f45c34f39d93c31b748cf44cd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=apex+digital+40+inch+tv+manual PDF link annotation
    • http://felagem.getenjoyment.net/hunger_games_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447906/normal_605b928b60b00.pdfIn PDF document text
    • https://rufudejipuxege.weebly.com/uploads/1/3/5/3/135347647/bb9dea8520.pdfIn PDF document text
    • http://ladirojenovezoj.mygamesonline.org/encyclopaedia_eorzea_volume_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_605d8ff9da165.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/dixosu_rufop_lemesutepu.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/8541790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_60396aff22dda.pdfIn PDF document text
    • https://muxajugukeso.weebly.com/uploads/1/3/1/4/131453177/jilekibo_rovulamo_bufej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_601be53616a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_6027011dcaa86.pdfIn PDF document text
    • https://dawikuwavuvuka.weebly.com/uploads/1/3/4/8/134866752/335485.pdfIn PDF document text
    • http://torixobo.mypressonline.com/domevizurogunotarabivojum.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/4804316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_b18615ac62204b78832f5525c557a460.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_29d511b2db6c4153a834d09587f968f3.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_4795d7abbc9741bf8429017c9b4b9360.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_b0e78e96432f42bbb1945a0d8ae7aa50.pdf?index=trueIn PDF document text
    • http://vekabun.myartsonline.com/51573462004.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_6f350382b0804adb879baae303a81737.pdf?index=trueIn PDF document text
    • http://filosoko.onlinewebshop.net/pifemiris.pdfIn PDF document text
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_af806f5fa36c440ab63be718068f9fe9.pdf?index=trueIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_8bde8d0d8a6d41f0ae17836f8f5a6db8.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_2d8cdaf7afbd4454b8151fdf82ce6e9e.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_5004b9ea874a4689a4b17057cc945e5e.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_8c0896ad8e02480f8e8bbe7084af8cb0.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 5560 bytes
SHA-256: 196cb898f269017c708b19b8a9e7397886e7985a7a7e56718ce8a9d85f5382d0
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 11720 bytes
SHA-256: bbee4ac6662e7f8fd254bd7e8b684cc92a7d1c8d400ebfef03de17016c6e7d78

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