Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d7ce1b8796fd5b…

MALICIOUS

PDF

73.3 KB Created: 2021-02-23 18:21:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 52b14add5fc71f78ab9722d5d9d97d7c SHA-1: 4163bbc1e9e4adf0c60a2dc2080dedcecf9f4ef6 SHA-256: 61d7ce1b8796fd5bd8db69ecafa127b01901e4967a77fe36962ac684835c0165
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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=acer+aspire+e5-571+hard+drive+replacement PDF link annotation
    • http://detonic-ro.website/the_ecology_of_plants_2nd_editionoiv9z.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/dupetuxu.pdfIn PDF document text
    • http://rte-ita.fun/apprendre_italien_gratuitv1p7u.pdfIn PDF document text
    • http://autobaff.xyz/mozekoxelovunizex9200.pdfIn PDF document text
    • http://mnclassis.org/ccna_200-_125_dumps_9tutpq91g.pdfIn PDF document text
    • http://frukt.fun/ragenajefq8ffe.pdfIn PDF document text
    • https://puwulafu.weebly.com/uploads/1/3/5/3/135329465/e51472f7f.pdfIn PDF document text
    • http://ladukusuga.22web.org/vlookup_from_multiple_sheets.pdfIn PDF document text
    • http://frankiearvelo.com/comprehension_worksheets_for_grade_6_englishdk43c.pdfIn PDF document text
    • http://ig-copyrightnotice.com/h100i_rgb_platinum_manualog8fc.pdfIn PDF document text
    • https://kimogixolemalo.weebly.com/uploads/1/3/5/9/135964987/39c921fdcc82a4.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/1750475.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
    • http://zimifad.epizy.com/xisufatok.pdfIn PDF document text
    • http://punegejofuj.epizy.com/eos_70d_manual_focus.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/39462960625.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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 5328 bytes
SHA-256: ae91886512b27752e858e096548892ae3b1baa4397b6dfd560893956c2332cf3
font_01_sfnt_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 10928 bytes
SHA-256: 083df326263d7ddbd2aa07bfd964a224f77f699dbca2d57338f36c312d16c757
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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