Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd3c9178268d5ce…

MALICIOUS

PDF

82.0 KB Created: 2021-05-26 13:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 422e5b97d0804e1732cf563a055c40fc SHA-1: dcbe5bbc05c2d2b5467a7423fb69b8d02246dffb SHA-256: bcd3c9178268d5cee19b87fad02a12a366b96f799e15e578602b8fcef1d3e803
164 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains heuristics indicating it's a phishing lure, specifically mentioning 'invoice or payment language'. The document body, though partially garbled, contains text related to 'Financial accounting volume 3 solution manual', reinforcing the lure. The PDF embeds external URIs, with a notable link farm heuristic suggesting numerous links to other PDFs, and a primary external URI pointing to 'dafemum.ru'. No scripts were extracted, but the presence of embedded URLs and the phishing lure heuristic strongly suggest an attempt to redirect the user to malicious content.

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dafemum.ru/strik?utm_term=financial+accounting+volume+3+solution+manual
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/nofitezusemam.pdf
    • https://cdn-cms.f-static.net/uploads/4484126/normal_6041777229e98.pdf
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fcc2e6decc28.pdf
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/1553684.pdf
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/pelidikozatevir.pdf
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5ffa33571390f.pdf
    • https://static.s123-cdn-static.com/uploads/4367903/normal_5ff64e2bd6cfc.pdf
    • https://cdn-cms.f-static.net/uploads/4475194/normal_603789d89b22d.pdf
    • https://cdn-cms.f-static.net/uploads/4447906/normal_6009f2bca8bc2.pdf
    • https://cdn-cms.f-static.net/uploads/4383568/normal_602f21c10710c.pdf
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/c663152fa.pdf
    • https://cdn-cms.f-static.net/uploads/4488322/normal_60143c6f7cf2e.pdf
    • https://cdn-cms.f-static.net/uploads/4472503/normal_6039555f39294.pdf
    • https://cdn-cms.f-static.net/uploads/4422876/normal_600fcd12c06c4.pdf
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/kubop.pdf
    • https://vebipebetas.weebly.com/uploads/1/3/4/0/134012388/b96eb67.pdf
    • https://cdn-cms.f-static.net/uploads/4446287/normal_605adf8b2e3d4.pdf
    • https://xafarigokexugu.weebly.com/uploads/1/3/6/0/136053206/joderawa.pdf
    • https://fagedudadisex.weebly.com/uploads/1/3/0/8/130874641/8320059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f43a1afa-a116-40db-b3aa-926429505974/alnwick_castle_harry_potter_location.pdf
    • https://uploads.strikinglycdn.com/files/9cd123a4-dc27-4b4a-8e06-e841cfd978a0/50661455028.pdf
    • https://uploads.strikinglycdn.com/files/59de4f89-0305-468a-a196-904d2532ef2c/10910416201.pdf
    • 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_off000101c2.bin
8eab43951b30cfcb87fc88e81fceaa60b696ba82e44b7fc6de6ff3bc44f1c228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 5204 bytes
font_01_sfnt_off00011374.bin
956c7c6f17e0dd63805d6afbbec1ec0d6b2d3d04535c03d4bef0ad802a0e914c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 10932 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.