Malicious PDF — malware analysis report

Static analysis result for SHA-256 847108c8e40a944f…

MALICIOUS

PDF

74.9 KB Created: 2021-02-15 06:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1d2b1274a971daed7be5d1701701247e SHA-1: bf407e70f7e15af9f5898cc652afd637a8478e38 SHA-256: 847108c8e40a944f794925bbef4bc39cc97f0594a2f254f71fe0d4a9f91bf512
126 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF files hosted on disposable domains. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the structure and URL patterns are indicative of SEO abuse or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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://leonvi.ru/wix?keyword=american+harvest+jet+stream+oven+js3000t PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380209/normal_601c7dd21a45f.pdfIn PDF document text
    • https://zefugomifavo.weebly.com/uploads/1/3/6/0/136087281/duzato.pdfIn PDF document text
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/6880263.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_6004c24bd13e5.pdfIn PDF document text
    • https://melesanej.weebly.com/uploads/1/3/1/1/131163783/3128113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_601a815516d8c.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/Yjc5Dgi/super_jabber_jump_5_level_15.pdfIn PDF document text
    • http://fitness1.space/lipeduxijida8duz5.pdfIn PDF document text
    • https://lomelamul.weebly.com/uploads/1/3/5/9/135994015/lolunok-dorukaloziwew-vutasavuzo-dajoruwisitafox.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/iRHvgji/wokolusufapobutozibafem.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/HhcjpsR/44150442371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ffb60e1e7ae8.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/NHigwhj/home_gym_assembly_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/razotefo/0Liexhh/37596190146.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/h9G0geX/tabubufumoguxowazekawak.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/khgjdgg/god_s_shadow_alan_mikhail_goodreads.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369771/normal_600343ef2bc85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowonedof.epizy.com/english_arabic_illustrated_dictionary.pdfIn PDF document text
    • http://lemujiv.epizy.com/build_a_gaming_pc_2019_guide.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_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 5440 bytes
SHA-256: 417401f3a4b305db155737b727ae4668eda47886baee406acad14689b8812f12
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10308 bytes
SHA-256: 25766b8aed80b6c8eef5f93d9e9d1d560b11c2d65434e46b6fd82940c7d800f9

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