Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb5969931316789…

MALICIOUS

PDF

68.1 KB Created: 2021-02-13 14:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 156f631143fc21a6ecd897f9f1fac78c SHA-1: 9bf45edb688a5ab37e24a9b84445734dadc13123 SHA-256: cfb596993131678999af74cc2e44ec404ba136f3f18a65221867a69a22a26873
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 a phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wb?keyword=chinko%20ekun%20michael%20jackson PDF link annotation
    • https://cdn.sqhk.co/jifigetuxu/hb9OUwH/7777966906.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/ucVhfsM/electrical_symbols_test.pdfIn PDF document text
    • https://cdn.sqhk.co/xigofidiw/xfjjAjd/jeviboxuxufalasizem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fde12ef41df0.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/etibAgv/69917824069.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/fQic7gf/96550822410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488116/normal_601f31d5a2800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_601f6fd3a7758.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/gRgggc9/ftdi_vegetarian_meal_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/c1idha6/diamond_diaries_saga_apk_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465687/normal_5feb534d59ec7.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/8d16857ce35b925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6011900088613.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/gdfJiaX/13683023846.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/ojelia9/okcupid_a_list_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_60178288838e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60128dda3e75e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 4988 bytes
SHA-256: e4b87ee409a7f01d45fa7a1cf42e3c29f17f5b85d0f534db5894c7145b27a09e
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 11112 bytes
SHA-256: 092f0df643bf7e133543fb3b24f8730123565887a907e2d35726313f58a2965f

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