Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bee5fef97915bc3…

MALICIOUS

PDF

87.2 KB Created: 2021-03-24 14:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6a04eb65bcece1d5dbfa3944fe941369 SHA-1: e19f43925b790896c660e51671b679eb31615b25 SHA-256: 7bee5fef97915bc30929d36905ef41976835d7be202c23e45b767e320bce081c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a primary focus on `https://midufefew.ru/award?keyword=before+we+were+yours+pdf`, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by indicating the PDF is part of a link farm hosted on disposable domains.

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://midufefew.ru/award?keyword=before+we+were+yours+pdf PDF link annotation
    • http://normal-id.com/ruger_ar_15_pistol_slingm9wk8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417827/normal_5ff8b88aa2efd.pdfIn PDF document text
    • https://vipugexisixow.weebly.com/uploads/1/3/0/7/130775501/wemisum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5fed6767c949b.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/65759929985.pdfIn PDF document text
    • http://bossyonlinex.com/mugijivisugowufwqs9i.pdfIn PDF document text
    • http://organic-ita.space/hp_partner_first_program_guide66mo5.pdfIn PDF document text
    • http://rasprodavaika.ru/how_to_fix_dsi_game_card_slottw7co.pdfIn PDF document text
    • http://vinnipoh.fun/application_definition_black_law_dictionaryg5cky.pdfIn PDF document text
    • http://tb-films.ru/97811975766mqsji.pdfIn PDF document text
    • http://fc-aromat.ru/974346929420ugr2.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/53264b5c423b.pdfIn PDF document text
    • http://belplitka.ru/kuta_software_infinite_algebra_1_combining_like_terms_worksheet_answersg7u8p.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/similarity_proofs_worksheet.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/bomifabipi/63560849362.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/hp_elitebook_folio_9480m_price_in_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/xewaxiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/2020_ford_mustang_ecoboost_for_sale_near_me.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_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 5036 bytes
SHA-256: 73dcf716110d7c259905928d8dd7c8b0e3b4caa896517e4491f3262c5ac37846
font_01_sfnt_off00012985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 10984 bytes
SHA-256: fe08e30c6c90b89cce2b3d6dfda300d5afbdc8fcc9df16566e7aa31f67b69699

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