Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc90e3ca4d2ef17…

MALICIOUS

PDF

72.8 KB Created: 2021-06-03 19:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acaa07bb01a35d690455f8fd067730ee SHA-1: 7cfc29fe00b85b927b1a4d9d3176d036d1feb5cf SHA-256: 6bc90e3ca4d2ef175b4290a9bebf155c19165feadbd469c5bb5461182bade89e
156 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, specifically as a phishing or SEO spam document. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The embedded URLs likely serve to direct users to malicious sites for phishing or to inflate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/pbw?utm_term=why+google+is+not+working+today
    • https://cdn-cms.f-static.net/uploads/4459166/normal_60240ff7ddaad.pdf
    • https://cdn-cms.f-static.net/uploads/4379236/normal_6022e4535f498.pdf
    • https://cdn-cms.f-static.net/uploads/4461748/normal_5fd92004db436.pdf
    • https://rajoligegade.weebly.com/uploads/1/3/4/5/134504333/tosumafonukokonuk.pdf
    • https://cdn-cms.f-static.net/uploads/4417214/normal_6032c4fea2855.pdf
    • https://static.s123-cdn-static.com/uploads/4412758/normal_6009450ce9ef8.pdf
    • https://static.s123-cdn-static.com/uploads/4481424/normal_5ffa16a23555e.pdf
    • https://static.s123-cdn-static.com/uploads/4405208/normal_5ff40ea555283.pdf
    • https://cdn-cms.f-static.net/uploads/4382643/normal_6046ccd24ad1b.pdf
    • https://benikadavax.weebly.com/uploads/1/3/5/9/135964790/32052.pdf
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fea359cb2448.pdf
    • https://kiwuvewe.weebly.com/uploads/1/3/7/5/137509443/2599366.pdf
    • https://cdn-cms.f-static.net/uploads/4450634/normal_60216fca6cb21.pdf
    • https://woxawilafuzuve.weebly.com/uploads/1/3/4/6/134669094/regaj_supowavofisa.pdf
    • https://cdn-cms.f-static.net/uploads/4413468/normal_601fd1d9782ed.pdf
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fdc7baa2dd0b.pdf
    • https://cdn-cms.f-static.net/uploads/4413718/normal_606c092f7a860.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://buvavipoluvu.pbworks.com/f/crasher_origin_mod_apk_terbaru.pdf
    • http://tusawijer.pbworks.com/f/fatezaxoxoruzolazezope.pdf
    • http://jitijaloj.pbworks.com/f/8567152473.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd5e.bin
e66053ad0ab646e29446d9297788f76c9aca4d171553c68541063ebce96cdd96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 5360 bytes
font_01_sfnt_off0000efb5.bin
3a338816b8b54e8374aa4807d9767465490fe6a61a1f5787b8aebe314cd505fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 11100 bytes

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