Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2df3a5adc6b375…

MALICIOUS

PDF

69.8 KB Created: 2020-11-19 10:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7095a27999f9e01c801d64d40eb2a24a SHA-1: d09e73109b0f94763ca37a88a841ac2c254b4381 SHA-256: 1a2df3a5adc6b375c66fdf45b825f1f240b111666d202a67880b6d3cae86b7cd
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious or spam 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/aws?utm_term=blogger+templates+for+business
    • https://lewonodi.weebly.com/uploads/1/3/4/3/134330754/6648627.pdf
    • https://nibojesuko.weebly.com/uploads/1/3/4/3/134329062/zudonil.pdf
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/be6b850f975.pdf
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/baf847277b73.pdf
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/tiviwisomevenu.pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/9193731.pdf
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/a73cbec3e716.pdf
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/7839702.pdf
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/a8b46.pdf
    • https://mepuzorow.weebly.com/uploads/1/3/4/5/134500467/8822959.pdf
    • https://vimefipivarek.weebly.com/uploads/1/3/4/3/134310944/baxemokejetober-vusupoto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/98002f0a-e4cc-4434-abb0-d31ce3979613/disixokuxorujeliroseroro.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_off0000d633.bin
c380901ffe51c1db1770affe3195144356a5aa248542dce11bc575734be8ea0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 5408 bytes
font_01_sfnt_off0000e87c.bin
eb13fda43d9d24562249b812edb052cad907088caddb8d297fe9f91e71a7cc8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 9928 bytes

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