Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6364d50f615385f…

MALICIOUS

PDF

61.7 KB Created: 2021-02-04 13:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7b1d0376bdd0e7573122d2d40f6d67b4 SHA-1: 8ca53706b477f2349475f879518462c58cf31bc1 SHA-256: b6364d50f615385f2201f5dca3b187cb612e9f7a594be2ea204207ca9e916dca
186 Risk Score

Malware Insights

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

This PDF file was identified 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 domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure itself, which is often used to host malicious scripts or redirect users, supports this assessment. No scripts were extracted, but the overall pattern points to a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=colour+butterfly+hd+images PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455176/normal_5fc70cc5e0c00.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/jcPgeWm/2115896880.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/jipgdhg/best_app_to_learn_spanish_words.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5fd08abebbfa6.pdfIn PDF document text
    • https://gonuvogizup.weebly.com/uploads/1/3/1/8/131857562/9829035.pdfIn PDF document text
    • http://cherrypimp.online/makivesezuripuganekagub5ui7.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/ge4igWr/best_video_editor_app_for_social_media.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5ff13a5a1ec22.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/oojdiho/football_2017_sea_games.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/dpjigf4/47103024982.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/fifhhQ4/sasabepajaxilajixude.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ffe15d50b3b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubalek.epizy.com/lineage_2_interlude_hawkeye_guide.pdfIn PDF document text
    • http://rivozisotuwiris.rf.gd/wagobinopakekewewijixo.pdfIn PDF document text
    • http://dupofax.rf.gd/72853903861.pdfIn PDF document text
    • http://punegejofuj.epizy.com/grade_9_math_worksheets_cbse.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_off0000b6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E1 5468 bytes
SHA-256: 7871229cd2bda458303cf0290b50dae1b56a1488ad10ee1716806f71a2e01eda
font_01_sfnt_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 9696 bytes
SHA-256: 8e8119ac6a751596871a79e7bd374f49546c03d0522deab5a4034e3e03694b91

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