Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd5ca23ae0595e7…

MALICIOUS

PDF

75.0 KB Created: 2021-02-19 19:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 008bea1fc30bd144f5d3b1073c1e40e1 SHA-1: 131ea47c608d3e7886a2c167319804b9f5f91df1 SHA-256: 7fd5ca23ae0595e7879bf59f7e813eafa0be6651e81be015838d8b2a814332e2
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content or phishing sites. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or SEO-based malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=how%20do%20you%20determine%20the%20end%20behavior%20of%20a%20function PDF link annotation
    • https://cdn.sqhk.co/goworonol/8yLDUx0/target_archery_stabilizer_setup.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/hji8jjn/90198906770.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/UhdiduZ/facebook_search_people_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/ig9Inhc/67208289329.pdfIn PDF document text
    • https://cdn.sqhk.co/wepugozotap/hiSjgfT/55566529915.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/soxowewapape_gevodoxanidup_rowogolej_xebidiwabokuvax.pdfIn PDF document text
    • http://sikuwolawotoja.22web.org/jixomumuriruka.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/iiiijhp/anger_of_stick_5_1001_oyun_club_indir.pdfIn PDF document text
    • http://punaweb.iblogger.org/dance_mat_typing_guide_level_3.pdfIn PDF document text
    • https://ruzejome.weebly.com/uploads/1/3/2/6/132681971/bifapikopebo.pdfIn PDF document text
    • http://zalofamanaw.22web.org/pubusiwuzamizarozusana.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/dghRjbm/wuzogifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ripazek.epizy.com/40644211438.pdfIn PDF document text
    • http://nedilopasosugop.epizy.com/company_of_heroes_2.pdfIn PDF document text
    • http://lamupilabixekuw.epizy.com/jegatutarexojupala.pdfIn PDF document text
    • http://viwefar.rf.gd/ly_answer_wikipedia.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_off0000e56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 5404 bytes
SHA-256: dbd242ea3a27520b348a6d0cf7886c60a92a901f6581564ef2963b75c869ab6e
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 11296 bytes
SHA-256: e162b21f74c25ceb4d170f5ea42c8e23bbab0ecbed981158b5ce5d1183eb9076

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