Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d3c5d3b39d6deb…

MALICIOUS

PDF

79.7 KB Created: 2021-04-09 04:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a55a42707c102879ed128481bf631ee0 SHA-1: 77d506d44b351967d8f534a6f31fa0ef8b9d7590 SHA-256: d8d3c5d3b39d6debf3d6441454617ab9881fb7f73a1d59bb7e23a1f56de22fcf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'bologen.ru/strik' which is flagged as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score strongly indicate a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://bologen.ru/strik?utm_term=hp+w2408h+monitor+disassembly PDF link annotation
    • http://kekijojovif.sportsontheweb.net/matrix_differential_calculus_with_applications_in_statistics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_6050761880847.pdfIn PDF document text
    • http://witomemu.scienceontheweb.net/agronomy_book_download.pdfIn PDF document text
    • http://zotoxilob.getenjoyment.net/wordly_wise_3000_book_6_lesson_3_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/Ogibifr/xugovarejabakiwajubeseda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_6012b0b71a399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_602162012b15b.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/gehiVap/17561396691.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_60153460333e8.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/ghiVtzG/good_captions_for_instagram_pics_with_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadilinozo/lUjeHjg/zosiviv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418178/normal_6007e35e79a5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojaginam.rf.gd/buwedujuvesigawigavugus.pdfIn PDF document text
    • http://jejafajiw.rf.gd/nautical_baby_shower_invitation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/47231837748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3abc7b3-8f20-4816-908f-57658f4dc5ba/dewibuxuro.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/lexatanovix.pdfIn PDF document text
    • http://gotafoveguna.rf.gd/statistical_machine_learning_methods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ed2a06-14bf-4390-8e6e-3199146b7cbe/72543625432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aec2e31-2d66-4be3-b6a6-6ac90b92e4f8/indian_history_timeline_in_hindi.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/fundamentos_de_bacteriologia_atlas_a_color.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/housekeeper_weekly_report.pdfIn PDF document text
    • http://rositeweb.rf.gd/how_much_does_spaying_or_neutering_cost.pdfIn PDF document text
    • http://jesegusanasukan.epizy.com/pitch_black_movie_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/48583340418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9ddf73-d8d8-4b34-a164-80ca5446d0ae/32344731597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0aadc03-c011-4479-bb4d-8445c830b3f6/what_is_capitalism.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 6048 bytes
SHA-256: a2e47cf381fb529c8a88cb6bdd22637456d9028b491071985bd4a91c03ae0d89
font_01_sfnt_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 10720 bytes
SHA-256: 64ddce21959765a0ee7e9a10a8d2d76e1d35b706b7b6abf8927b18ad2de6c45c
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 16376 bytes
SHA-256: f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828

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