Malicious PDF — malware analysis report

Static analysis result for SHA-256 464c4a0ab9531e19…

MALICIOUS

PDF

75.9 KB Created: 2021-02-27 23:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fa3477d0c59bf49a080ae773c26147e1 SHA-1: a876cfa3cf6ee7a8ef5ade4ce2258d7f86959304 SHA-256: 464c4a0ab9531e193479e3a0dda962d83b3584ec179e16fadabfb8df6ef98a69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as document downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=how+to+connect+honeywell+thermostat+cm927 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421768/normal_5fd243240f2c9.pdfIn PDF document text
    • http://dududuw.mypressonline.com/bakuweminekiwivoxovesozok.pdfIn PDF document text
    • http://tehnomaster.net/teamwork_leadership_word_search_answer_keylql7b.pdfIn PDF document text
    • http://wetikufuwigiwox.iblogger.org/jakulakeputew.pdfIn PDF document text
    • http://badgesverified.com/commercial_cool_air_conditioner_12000_btu_manualex40c.pdfIn PDF document text
    • http://usacreditreport.info/castle_ravenloft_book_neverwinterrlhrc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420745/normal_5fefc8a6652f1.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/31120719557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fe0442de29fd.pdfIn PDF document text
    • http://hempmap.ru/34861352952z7nn3.pdfIn PDF document text
    • http://italysummer.fun/no_crop_photo_instagram_apk814p2.pdfIn PDF document text
    • https://sazalilo.weebly.com/uploads/1/3/4/5/134592982/gajizupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowimirozox.atwebpages.com/is_general_dynamics_stock_a_buy.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 5564 bytes
SHA-256: 9d26388405c99ff110de97993faa3e9e448c58316abfee687505b4e693f98a43
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10856 bytes
SHA-256: 847f128084b93cf31dc33a36658d27ee3cdb5894d0c447c475d1523792b223b3

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