Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6b7a4ae5790ce4…

MALICIOUS

PDF

69.7 KB Created: 2021-01-11 22:41:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 27a9d0e005efdd1c712923079d908115 SHA-1: 18807c50cfd201de9568f4f751d12b79daa1254b SHA-256: 3c6b7a4ae5790ce4c8e6709d3ad59d2b9c869b548d468166f6ca618255c4a5b4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of embedded URLs pointing to external PDF files hosted on various disposable domains, suggesting a link farm or SEO manipulation tactic. One URL, https://cctraff.ru/123?utm_term=where+to+fill+sandbags+near+me, is flagged as a known malicious redirector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=where+to+fill+sandbags+near+me In PDF document text
    • https://vokejivig.weebly.com/uploads/1/3/4/3/134322053/vizekameburibok_lafowisanejov_ketaku_tuporuvus.pdfIn PDF document text
    • https://vujugorakiti.weebly.com/uploads/1/3/4/7/134719441/1b4fb209f.pdfIn PDF document text
    • https://zakexexeg.weebly.com/uploads/1/3/4/7/134720850/5534704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462727/normal_5fa26b82add16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5fcbd76294e5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_5fb293b714bc1.pdfIn PDF document text
    • https://site-1188419.mozfiles.com/files/1188419/19825509259.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/5021670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fdb8f2e33364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f9a49413e847.pdfIn PDF document text
    • https://site-1178214.mozfiles.com/files/1178214/farkle_dice_game_amazon.pdfIn PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/1258177.pdfIn PDF document text
    • https://puwekuzegavezek.weebly.com/uploads/1/3/4/7/134734886/00ec4e60c9b.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_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 5476 bytes
SHA-256: e1c381879b67c5329625f8ab3db1d50d54eec8b58c9a5a39a4641907b10b0a25
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 11144 bytes
SHA-256: bed6b6149bbc3bec220ab51d33a6189fc2cde85c13c9a38214e80ad8e2ea4044

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