Malicious PDF — malware analysis report

Static analysis result for SHA-256 93dfcd4fc5081514…

MALICIOUS

PDF

69.4 KB Created: 2020-12-30 03:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2304d42ea39fdfd15f14781a0681e70 SHA-1: ba8d2dbc1710c4ffbc741d79064e0acbc9eeabb7 SHA-256: 93dfcd4fc5081514fe373cd2c00706e37517fbb3621eff0d37a6a90598add629
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used in SEO spam or to redirect users to malicious sites. One of the primary links points to 'traffset.ru', which is suspicious. The presence of a link farm suggests an attempt to distribute or host malicious content, possibly through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://traffset.ru/strik?utm_term=real+piano+app+download
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/6502099.pdf
    • https://static.s123-cdn-static.com/uploads/4466411/normal_5fcdaa15c239f.pdf
    • https://cdn.sqhk.co/vowibesep/cjdgdjd/venirobolebarisave.pdf
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f896f720b81d.pdf
    • https://cdn.sqhk.co/butiluluvuk/ihE3uLb/eyedropper_tool_procreate.pdf
    • https://cdn.sqhk.co/moranunemuk/6mhiKV9/76629123836.pdf
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fe18ce4e42c8.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/88be7ff576edae.pdf
    • https://dupujemewo.weebly.com/uploads/1/3/4/0/134040979/kevukurasigakat-zaminobi-widunomi.pdf
    • https://cdn-cms.f-static.net/uploads/4416810/normal_5fb25629c7bbf.pdf
    • https://kidubaviputotej.weebly.com/uploads/1/3/4/5/134520398/lapis.pdf
    • https://cdn.sqhk.co/molofagaji/hfijgdp/how_to_discipline_your_child_without_hitting_them.pdf
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdb94f8d2b97.pdf
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/7348539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e4.bin
1b8c2f654dab96c20ab7ef0d01d43a2f30f05963e6736aa50e98f0ec6c0fa586		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 4776 bytes
font_01_sfnt_off0000e54d.bin
ecc0be4a3aa366cbb47684b4b234201ac74b7a89f96db70960aaa0f480483670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 10428 bytes

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