Malicious PDF — malware analysis report

Static analysis result for SHA-256 894f2a5849356211…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 17:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0451f4ec933ded2490d939b889e480a6 SHA-1: 236cf1ebfa26a892e926210c2e983d703061f222 SHA-256: 894f2a584935621101434d001d08add0c05ef68f4be3c626ac3c8434c78fdcf0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, potentially leveraging embedded JavaScript for redirection or exploitation.

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://jottigo.ru/aws?utm_term=what+is+the+greek+word+for+called PDF link annotation
    • https://cdn.sqhk.co/wanevakaxuma/ShdpKha/learning_thailand_language_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/gGgdgcV/99170552063.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/gifahja/43649862757.pdfIn PDF document text
    • http://wedidizelajat.mypressonline.com/society_by_laws.pdfIn PDF document text
    • https://sikukaposarimi.weebly.com/uploads/1/3/5/3/135307882/dulelosexot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_603aefa22575c.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/marketing_plan_example_powerpoint.pdfIn PDF document text
    • https://xomaribimufad.weebly.com/uploads/1/3/1/1/131163516/fetujeni-nakem.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/d5jcJjy/football_manager_2020_best_tactics_arsenal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_60218d9903ffa.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/yjdhiOU/pubg_mobile_gamepad_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5ffd391f1c28c.pdfIn PDF document text
    • http://mojizeki.22web.org/back_end_web_development_tutorial.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/5416314.pdfIn PDF document text
    • https://sowidokobixu.weebly.com/uploads/1/3/1/8/131856306/mobapuwote-dakufe-tadebaba-fikim.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://uploads.strikinglycdn.com/files/90af5b81-c7fa-4e73-95e4-b9c1eb191483/ubiquiti_nanostation_m2_access_point.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abff1732-3025-494a-8e44-26a5df94f308/usps_correct_zip_code.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/bully_lite_mod_size_kecil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e23cfc-4791-4e10-947f-404931ccac79/91685035123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea829461-bfbe-440b-83b1-40918eb7d9f6/jaxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae228ef-4947-4a4d-a74a-57f8335ab9d5/12243479483.pdfIn PDF document text
    • http://vosafaw.rf.gd/2004_porsche_cayenne_turbo_performance_upgrades.pdfIn PDF document text
    • http://zibakogemigana.rf.gd/12686606666.pdfIn PDF document text
    • http://jeromixowo.epizy.com/angularjs_viewer.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_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 5136 bytes
SHA-256: e5ed1d982ffcd7bde57290d1fde3d1747533874a421ac1d2f2d15578a1392d5f
font_01_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10612 bytes
SHA-256: d665032c55a19c7f964d951e534e94ae40ff8e757ea14934d5bc23735ada92e1
font_02_sfnt_off0001332d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361