Malicious PDF — malware analysis report

Static analysis result for SHA-256 82233559f61169e6…

MALICIOUS

PDF

78.0 KB Created: 2021-01-31 21:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00fec757ba61c95fd8c84f531b101743 SHA-1: 690fd0185e48345673b79af8cfaf38dfc2681680 SHA-256: 82233559f61169e687ee72f5b0ea6e52732034615c4d4e1e9f13d14d80baf120
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, forming a link farm, and directs users to a suspicious URL (https://baarspo.ru/wb?keyword=spot%20commodity%20prices%20today) that is likely part of a phishing or malware distribution scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/wb?keyword=spot%20commodity%20prices%20today PDF link annotation
    • https://cdn.sqhk.co/zopimoforaja/gjavgMu/sixetoxoduwekobejowove.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/JgcAhat/73420340099.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/89f114a9436.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/IiaVJZv/46418037315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_600c6f2778236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426675/normal_5fe1cc194f372.pdfIn PDF document text
    • https://zumonula.weebly.com/uploads/1/3/5/3/135323502/4556469.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/f17c197.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/mixiwevigotuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461780/normal_5fe9da7a892db.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/jfydhac/fashion_pink_playing_cards.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/android_developer_salary_in_india_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/creating_if_statements_in_microsoft_word_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/god_wallpaper_free_krishna.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/high_school_basketball_court_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/android_developer_cv_format.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_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 5392 bytes
SHA-256: 6f7f9018dfca5089b10544746991a3a82dc5c986f7fa6a037eeafe8394257c63
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 11336 bytes
SHA-256: 0d6507f137855ad9e940dda0355132baa9d175c51707461c8484624d169f8868

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