Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caf32469fe5b181…

MALICIOUS

PDF

68.2 KB Created: 2021-01-12 13:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bc026d7333914283f29df205ff6b5088 SHA-1: efa0e13851e550ae6f7bc9d0ec5b339e8dafe3f6 SHA-256: 3caf32469fe5b181b32229386e18e2b72c498d8386a9b5bca07e32891f5105c0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://trafficel.ru/aws?utm_term=unison+league+cheer+squad+uniform PDF link annotation
    • https://cdn.sqhk.co/giganopof/giaicTa/87978468047.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/hfKZZje/garobamidek.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/hiheje5/86982531461.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/ighgfAg/gorobakumofirexifoven.pdfIn PDF document text
    • https://cdn.sqhk.co/guxudakakali/sgiiajg/g_switch_3_unblocked_games_77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5ff7088d42b00.pdfIn PDF document text
    • https://mapupuvegov.weebly.com/uploads/1/3/4/7/134712300/819e0416a.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/h0qa9ge/electronic_components_store_around_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/gHRqjjD/konejewekovij.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/rotizizalipi-xulejowo-wegevok-xutijub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f922e99becd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_5fa4432763612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 5552 bytes
SHA-256: fca847741aef08c4ebce0e0a5975c8e51dd030a91ba81c751deb4927a582b8a6
font_01_sfnt_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 10284 bytes
SHA-256: 80cd9341d5f682a462a755230a7b78aa2024bb7750a44f3fe5c528a149384739

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