Malicious PDF — malware analysis report

Static analysis result for SHA-256 294a63c466851d91…

MALICIOUS

PDF

76.9 KB Created: 2021-03-24 09:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 58e7d012aae4928cd2f25617938c2b47 SHA-1: 1cc57d900b9587104851d725ed58af0336e7e15f SHA-256: 294a63c466851d9155fff58f064ec23619929c65d89056760155799c96b9b7c0
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 pointing to disposable hosting, 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 embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=how+to+descale+your+keurig+with+vinegar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382789/normal_603c4d3a538ec.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/03.06_employment_and_occupations_writing_assignment_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/my2jggf/print_to_string_python_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_604e0ae1774f7.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/75980248288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_604e46e38d302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_6014571c7f0ed.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/ielts_speaking_1_questions.pdfIn PDF document text
    • http://mebel-albero.ru/gevitobatibewis0y0eq.pdfIn PDF document text
    • http://podarokinsta24.online/bts_butterfly_video_songsm7xe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_601a80150e3fa.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/wogaxugevajtv6x.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/hbjblij/91168242899.pdfIn PDF document text
    • http://xafawotilujos.mypressonline.com/texufe.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/sample_application_letter_for_teacher_in_private_school.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a56cc1-30b0-4d8a-8d2d-5b0081b7e7a8/yoga_asanas_names_and_pictures_and_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b26695-a865-43cf-82a0-3fdf8445be71/how_to_reset_maintenance_light_2015_toyota_prius_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ef0102-e71f-4a63-b699-c8aa3a9cdcf8/bosch_glm400cl_home_depot.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_1a6dc4506dfa45ba91601c6481e3369b.pdf?index=trueIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_eb0dc805f39444cd9aa956960f96c3e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d1664a-b1b8-493b-a03f-afa340fc4391/74898956878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d2a7f3-a4f9-4848-af62-179cb7b6df07/mounting_sunsetter_awnings.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 5480 bytes
SHA-256: 1b1ce36d6a54b53ad88486e3749b035c1f5bedc00f2b19e918a57cf834419754
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 10000 bytes
SHA-256: 5904bfe192da4d81840b1994d897dc36d1d9184bb0c9f190f264d469b15e04ce