Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86e68942031fa3f…

MALICIOUS

PDF

66.3 KB Created: 2020-11-13 21:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f5327f15e378dc7018b6a17e13b86d70 SHA-1: 8cb44d9273d32d2cc6e703ca88ce779fa0784d6c SHA-256: a86e68942031fa3fe2e242d1a410f2e93e5bca11b89aec1d7e91e783c4784d39
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to distribute malicious content or lead to phishing sites. The presence of urgency and download button lures in the document body further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=windows+vista+ultimate+sp2+iso+32+bit+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376369/normal_5f8c7a615d5e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5fa7c07c5e7c0.pdfIn PDF document text
    • https://xulegavumorojok.weebly.com/uploads/1/3/0/8/130813780/guvofokudara.pdfIn PDF document text
    • https://xogedagiwen.weebly.com/uploads/1/3/4/3/134398587/bemavi-gemesezefoguxob-dekigefunazo-gupinutomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_5fa1f8197f7d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392209/normal_5faa77044d294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5f98cf9ac53b7.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/jazuravazaguz/3414741051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97440c97-898f-4fa6-97da-1db5115314ea/88828908356.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/79356861834.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/55760043591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6dee201-2391-4a9a-891e-0083886850a6/99156589850.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_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 5608 bytes
SHA-256: 9eca8b6b6a83f0fe6f30f89fccd94d351b412692651c171a750565e721c73d4c
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 10584 bytes
SHA-256: 7ac97b1bd671a76830a6247ee2d4c308a0249e4435b03a5765dea226ea89d0b3

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