Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e4132447b44acb…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 04:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e151ffedb917399c469a51b4a9bb2617 SHA-1: 9d573426af996bfdf972832f005ac76437e9123b SHA-256: 95e4132447b44acb72132b3538980168900be565af4a20700d4084e02cda8d0e
156 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://bologen.ru/award?keyword=the+natural+rate+of+unemployment+occurs+quizlet', suggests a lure related to search engine optimization or academic content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to redirect users to potentially malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://bologen.ru/award?keyword=the+natural+rate+of+unemployment+occurs+quizlet PDF link annotation
    • http://islta.fun/commercial_sublease_agreement_template_uk5huiw.pdfIn PDF document text
    • http://uaregroup.com/book_destinies_of_the_soul1gvbi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fe5cf9a13445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fc7b8b2e2917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_602aa5120e4bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_5fdbb19f3fe75.pdfIn PDF document text
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/b3834.pdfIn PDF document text
    • http://pedron.fun/403579161097ywfq.pdfIn PDF document text
    • http://fezuwudanupemav.22web.org/36821621758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_602aeb34ac76b.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/jufasukobogopamevu.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/rizezobabub/pizujeluza.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/hdpe_plastic_sheets_4x8.pdfIn PDF document text
    • http://milodip.epizy.com/nudot.pdfIn PDF document text
    • http://wafogaz.rf.gd/50724264103.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/wabupetutig.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/what_is_the_role_or_job_of_an_organism_in_an_ecosystem.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/bajenesezig.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/kabir_bengali_movie_hd_720p.pdfIn PDF document text
    • http://nelipofamarul.epizy.com/equine_answers_mud_warrior.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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 5484 bytes
SHA-256: 1dca57f6e7c25288e89cb9381a59b5afff052b9aa2958e330cc7c8057dc4d623
font_01_sfnt_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 10324 bytes
SHA-256: 17e307851097f845abda2b71b27b9bf32de0d7b8bdbb927ab74fe548c284a877

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