Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5ed704e1d6e696…

MALICIOUS

PDF

73.0 KB Created: 2020-12-27 18:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dab8fb3f6180c281c2710634c2bf8c89 SHA-1: 7716b7ba303bf4c1317f7d4b31627e83eb7ba0aa SHA-256: ef5ed704e1d6e696027f31fa71864f513c876a7fd524db838373cdd531c3e4a0
226 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to direct users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates it may also be used to trick users into downloading password-protected archives, a common tactic to bypass security scans. No scripts were extracted, but the overall structure and link farm behavior point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/123?utm_term=dark+souls+backstab+sound PDF link annotation
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/pakerujeruga-wuzux-ninozevul-mugolutig.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/rivobapegesoki-gotaf-luzot-zusunusuwawagaz.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/U3GLQcp/77008338250.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/0458f1d7b85096e.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/lezijawute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412588/normal_5fdf08bf75afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f9ab75653c72.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/8516fe8170fbf.pdfIn PDF document text
    • https://pezujotage.weebly.com/uploads/1/3/4/3/134318684/novovoxulu.pdfIn PDF document text
    • https://ribavazo.weebly.com/uploads/1/3/5/3/135322422/7873aed53.pdfIn PDF document text
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/dupufevu.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/gfS10gi/lolilifufuzewavabokinej.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/0da7fca7e.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/pegusodovujoreb-nigibulixegep-wanujaguzub.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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 5136 bytes
SHA-256: 09c98e0e8197fc490d380fac593aa47f1c88e67d0d062e69504d002c1352b6ad
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 11508 bytes
SHA-256: 6894dc9e7e4298c0f36cf5d6a75e2006a64abce92c3d0e7b34cbaf2d268bb127

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