Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f0efa942fd9a50…

MALICIOUS

PDF

79.9 KB Created: 2021-02-19 17:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6651e604c43aa36e3112cb515ff5b8c6 SHA-1: 7a90fc0e2f070cf265bfdd1ec67a78ae348c17f6 SHA-256: c4f0efa942fd9a50722a47a380c1695015874e5ec1b53af21fd672e6119e91b1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document contains numerous embedded links to external PDF files, many of which are hosted on suspicious domains and appear to be part of a link farm. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common tactic for malware droppers. The presence of multiple suspicious URLs suggests the document is designed to redirect users to malicious content or download further stages of an attack. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://maypoin.ru/strik?utm_term=how+to+run+simple+macro+in+excel+shortcut PDF link annotation
    • http://itawomen.fun/96964814266tn1ja.pdfIn PDF document text
    • http://8gusevshop.website/vipinuttloc9.pdfIn PDF document text
    • http://airned.ru/titan_quest_atlantis_nintendo_switcho0yvx.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/y9Jjejf/86303881527.pdfIn PDF document text
    • http://academic-club.ru/61031285894wu0zq.pdfIn PDF document text
    • http://paypallsecurity.com/5141170074uf1uh.pdfIn PDF document text
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/vununutegajino_kamaze_tuvesalelibuzir_sijeros.pdfIn PDF document text
    • http://centerverifybadge.com/brocade_g620_user_guideja4ga.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/5084114.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jagaEjj/sci_fi_movies_free_download.pdfIn PDF document text
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/aa29aee4c61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/dooars_tourist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/iphone_4s_latest_ios_update.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/51701537410.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/ascii_values_in_c.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_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 5296 bytes
SHA-256: 27f80f73eefe48925453a2afd9495eb5999e4b1ac7c7da36841d3bdb8c61475b
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10816 bytes
SHA-256: 6ed6e8040048019014bb36ca0edcedceee5e3ebf6626795ea0b2ff7b4a492142

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