Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41726977bd47b25…

MALICIOUS

PDF

69.2 KB Created: 2021-01-15 16:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a61d275ebe5eb215f031355ee608c743 SHA-1: 69b6e1b85c56718207f547787b1b0a6e96989fd5 SHA-256: a41726977bd47b2517f261460d2eb68521b49bb22aa3a51d2d991ec4b8ec8094
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as Pdf.Phishing.Trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=seneca+high+school+sc+football PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486206/normal_5fe9f8f580a49.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/jgia9ja/racechrono_gps_lap_timer.pdfIn PDF document text
    • https://detagugijubofex.weebly.com/uploads/1/3/4/3/134365812/8338141.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5fc4c37037933.pdfIn PDF document text
    • https://vojitimene.weebly.com/uploads/1/3/4/5/134596684/xosulukug-veteredexus-rozimula-nizaw.pdfIn PDF document text
    • https://cdn.sqhk.co/timemowab/lg83dgh/learn_electrical_wiring_diagrams.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366343/normal_5fe435edea040.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/gijzEQA/beyond_ynth_hd_mod_apk.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/tuzamada/boating_certification_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/99235047202.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/lazojera.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/metformin_hydrochloride_tablets_ip_850_mg.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_off0000d265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD265 5292 bytes
SHA-256: 8656c01074efef80b3f07c8d9d4e78c425dafdb1968929e0a73c0dc5ce31ac21
font_01_sfnt_off0000e46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46C 10616 bytes
SHA-256: f352615e619a39208b40a9c55f7d5aacf3661be7aee577fecb59c17c7564f674

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