Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2da93e01c3e069…

MALICIOUS

PDF

80.7 KB Created: 2021-02-28 08:24:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1249d998fe492b6fd9d7ca26683532af SHA-1: ef91575f0acc85f27ac7b05ed22fdbfdd3423e76 SHA-256: 1b2da93e01c3e0691d5faa2adab78c84151a29686e03beb8ccc3799e660a4223
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/award?keyword=how+much+is+a+straight+flush+worth+in+cribbage PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468268/normal_5fee406153979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_601f0480e7767.pdfIn PDF document text
    • http://stikc.xyz/18380031792ysxga.pdfIn PDF document text
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/fimowufur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5ffbba5a8c001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fe57ec680bce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5fdf547eb6fa2.pdfIn PDF document text
    • http://strahuemsya.info/96089200203t9fp0.pdfIn PDF document text
    • http://vorecan.fun/7931068394575xrh.pdfIn PDF document text
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/6983549.pdfIn PDF document text
    • http://fc-aromat.ru/zifaxaxd6mfg.pdfIn PDF document text
    • http://taygerr.com/birthmarked_book6zqio.pdfIn PDF document text
    • https://babulavired.weebly.com/uploads/1/3/0/7/130775389/ab561fe82ba5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485799/normal_60146266205bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407100/normal_60049121b4228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419629/normal_5ff04796ebd2e.pdfIn PDF document text
    • http://momentikshop.space/jupiter_merlin_income_factsheethof4q.pdfIn PDF document text
    • http://uuuuull.space/46464246124j59lv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/risalenefazozo/skylark_hoagy_carmichael_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/aadhaar_enabled_biometric_attendance_system_software.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/septuagenarian_stew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 5372 bytes
SHA-256: ac2e04d0ee9e93c441563065d3e26b0dacc521fcc7813f0e134107c5332226d4
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10348 bytes
SHA-256: dff11ac145ec1c990801a910995568059a2e35d65243095245b11fb05532e9d5
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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