Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf1e1c5edf00d0a…

MALICIOUS

PDF

79.8 KB Created: 2021-04-03 02:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7b4c4e1bc1eafd238f0b1002a863e373 SHA-1: 7bc5f976504ef429fe26d64ea7227336ce195f26 SHA-256: edf1e1c5edf00d0af9a345ebbdb36c0e2909c0865e804d75cd454b3cd47fc354
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing variant. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://vilenefex.ru/award?keyword=software+to+split+and+merge+pdf+files', is likely part of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.NoRobot072127-9875389-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.NoRobot072127-9875389-0
  • 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://vilenefex.ru/award?keyword=software+to+split+and+merge+pdf+files PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454822/normal_5fda627342b74.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/zOgcIgd/90357679738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_6041bb18cde27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_600f246835944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_6035ce4494765.pdfIn PDF document text
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/3e529d503e59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_604fcce51ad86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_602ff7d1d2573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fe6fc19a3f4b.pdfIn PDF document text
    • http://nazawate.iblogger.org/love_good_morning_pics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_60090243027c4.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/31c7f7af6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447460/normal_5fdae3c06cf07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_6010b007cfa7a.pdfIn PDF document text
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/f0b530.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/SjckhaJ/marble_machine_kits_for_sale.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/8660862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_60593d0bc84a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456377/normal_6001253d94ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458388/normal_60200ac67c0f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegozijagomon.rf.gd/deep_learning_algorithms_book.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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 5556 bytes
SHA-256: 6027df5b040cda274359ae622f05002888c2f0ed394772d19c6216cfda49c56b
font_01_sfnt_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 11524 bytes
SHA-256: 570f2435543fd97370988630441559a18ad5a8e428842dfa3d4efca6afaa9dcc

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