Malicious PDF — malware analysis report

Static analysis result for SHA-256 603d3e15a60ebde4…

MALICIOUS

PDF

71.3 KB Created: 2021-01-25 09:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a9acd76a4ee8e4043fc320ab23ca5d0d SHA-1: 9eed2f171730faa08bb93b636f2851a02088c0bc SHA-256: 603d3e15a60ebde4b689769b2eadad45ac0c0c42b48af703d34d33e794c34f99
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. The document body, though heavily obfuscated, appears to reference a premium application download, aligning with phishing and malware distribution tactics.

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/123?utm_term=angry+birds+space+premium+apk PDF link annotation
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/3795624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fdf490ccc1e3.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/jdgiShg/26846334276.pdfIn PDF document text
    • https://jimurapixow.weebly.com/uploads/1/3/5/3/135399705/fevawitedozakup-pedosanuzase-dikuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/SgjfRl3/zumepemukinoxasumol.pdfIn PDF document text
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/9996bc24b9.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/MjifYbR/plants_and_animals_worksheets_ks1.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/j62lNhb/digi_online_top_up_maybank.pdfIn PDF document text
    • http://vijufik.iblogger.org/bhoothnath_movie_comedy.pdfIn PDF document text
    • https://zidimegaga.weebly.com/uploads/1/3/0/9/130969389/vupan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibogifimot.epizy.com/zexeregusokutona.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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 5656 bytes
SHA-256: 16c78470ed4b018524bcfc0f31124609c57184fb538adc9625d0075eb74347ac
font_01_sfnt_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 14872 bytes
SHA-256: e3e3bb388a5134c3f5adbf8c1e68c925a4ff4cc90ef6adff719e95c1fed01895

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