Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf255b30a2750a49…

MALICIOUS

PDF

64.7 KB Created: 2021-02-19 19:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 52a1fc95362e3aa0426649d0c8550eef SHA-1: 7350bfe9991c78f14c1220484bc63550d02044e8 SHA-256: cf255b30a2750a4978163f7d19c4b59ddefabf49c53f2398d69468e5f13e9141
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary URL, 'https://druttle.ru/strik?utm_term=what+is+maxwell+jenkins+net+worth', suggests a phishing or scam attempt by mimicking a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=what+is+maxwell+jenkins+net+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fd77f8daa842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409425/normal_5ff77fcbed7cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_602d5a2015a8c.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/Mu0wjbJ/drum_kits_for_sale_used.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_601b6631e6dcd.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/mavemedufusa.pdfIn PDF document text
    • https://cdn.sqhk.co/dusawugivepo/c0kheSV/totem_story_farm_mod_apk.pdfIn PDF document text
    • http://medgaj.com/x-b_-sqrt_b2-4ac_2a_calculatorj8apb.pdfIn PDF document text
    • http://foodguideblog.com/dota_2_guide_itemsl6z38.pdfIn PDF document text
    • https://wexaluzeneroxer.weebly.com/uploads/1/3/0/7/130776054/lolafokusujakeveb.pdfIn PDF document text
    • http://marketeuro.pro/50842420352a9lyg.pdfIn PDF document text
    • http://totalcreditreport.info/dewafitudadodununo00ep1.pdfIn PDF document text
    • http://samettemiz.xyz/biophysics_and_molecular_biology_patrt9ct.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/penale/freelance_website_design_contract_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 5028 bytes
SHA-256: 93f03660daec2709f221cd9224bc709c0b809ee10a4f0b902526b361891c9ec8
font_01_sfnt_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 9316 bytes
SHA-256: 1abce091da852a339eed8afde49b4576b25a8c85040db7023d03c56aac5f6a20
font_02_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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