Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8c04976bdaa9f1…

MALICIOUS

PDF

94.3 KB Created: 2020-11-25 00:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4fb5d9bbfdbd3ed5b6a17b747589ca14 SHA-1: 2ba92e2f62544fe4b8982ffb634aa6801d317f02 SHA-256: bc8c04976bdaa9f113f49330ea90cb388d4bf80b5fa5f2bde50a3b27e087d85e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate this behavior, and the presence of a URL with 'utm_term=six+sigma+green+belt+ppt+free' suggests a lure for potentially valuable documents. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafffi.ru/aws?utm_term=six+sigma+green+belt+ppt+free PDF link annotation
    • https://misajutedatid.weebly.com/uploads/1/3/4/7/134755713/zuxof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fb758ec8b887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415291/normal_5faa551a262bc.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/2177856.pdfIn PDF document text
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/2566416.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_5fba6526e1a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5fb792792ac35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5fa67fc60f453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_5fbd83d6c5900.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/5843987.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/50a01.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/ligole/refivizodatelurelalijek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdaf8c02-f8ab-4352-b323-797be9fb4722/45591159453.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_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 5532 bytes
SHA-256: 5fea45c54ada081f00b0fd4d8658965ee526a9f2b343927f4b2aa56afaf740cd
font_01_sfnt_off000142d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D1 12160 bytes
SHA-256: ad2d476bf20ba7d1a2b01a0f51361b28ed842964042f9031fcf21fde49d49589

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