Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7f389b3f94cd0d…

MALICIOUS

PDF

72.2 KB Created: 2021-02-17 15:47:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6e4c42d1ef1ac9c572d2692860e3cff0 SHA-1: fca27e5ef746333d1161aca6327f6737a8fd2b8e SHA-256: bb7f389b3f94cd0d929eef4835e32810ebe757a5c8c8a96380e371488c149015
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to external content.

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://maypoin.ru/wb?keyword=how%20to%20set%20a%20brinks%20timer%20model%2042-1005 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450876/normal_5ff552745f7c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_60013ab58a207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445737/normal_5ff1f197b4e5f.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/nutaguxamegemug.pdfIn PDF document text
    • http://votatiji.22web.org/xuxuwabale.pdfIn PDF document text
    • https://tugewenexi.weebly.com/uploads/1/3/1/3/131381976/fineva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_60179c2ba8976.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5ff9264cced15.pdfIn PDF document text
    • http://nejepogiz.iblogger.org/clasificacin_de_las_cuentas_del_balance_general.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/vjjehcW/54108656089.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5fe1c55d9e87d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fed73fde7aad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5fe22cb4b2809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5ffe0c213b56c.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/tiniruru/levofloxacin_davis_drug_guide.pdfIn PDF document text
    • http://matujuluji.epizy.com/avast_cleanup_premium_crack_apk.pdfIn PDF document text
    • http://wepatimaleb.epizy.com/vive_le_civisme.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/aap_infant_food_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/beginner_piano_exercises.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_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 5584 bytes
SHA-256: 0df3357032e0883144e89e5b8062d27d6342ba21f348c39263920a2f5c3c4d4a
font_01_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 11168 bytes
SHA-256: b29cc7ddacdf5db127606c638c483471187e7cb09ff939678872805028c25cc2
font_02_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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