Malicious PDF — malware analysis report

Static analysis result for SHA-256 275c91fada3f8085…

MALICIOUS

PDF

85.9 KB Created: 2021-03-30 20:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e21c9dcc71889b249caf10527e554ac0 SHA-1: ced3b0804e55492f55107ac4fb85d9ee5c30f9bb SHA-256: 275c91fada3f80855f46e98e324ae7830bf0840ecaca7a5c11e28a3e70c58b5e
166 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be part of a multi-stage attack, potentially providing a password to decrypt a subsequent payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vilenefex.ru/strik?utm_term=what+is+the+latest+firmware+for+fios-g1100 PDF link annotation
    • https://cdn.sqhk.co/tifisizeliz/25iaIge/marketing_and_advertising_agencies_nyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5fff283c2bbf2.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/gjfenhh/falidivomupuzivijox.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/CkgckZ5/carpet_cleaner_machine_bissell_proheat_2x.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/SXujiUB/bisakumabijig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5fca5a564a707.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ihgdZE8/putewepor.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/aJwM4gg/safuvixisojiwodo.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/VjfXhhG/77636686698.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/dMejeLv/mega_cash_days_street_outlaws.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/peter_pan_storybook.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
    • https://s3.amazonaws.com/dubiditiginowo/discovering_dna_structure_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/chapter_2_animal_farm_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/sutonnymj_bold_bangla_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/92849845300.pdfIn PDF document text
    • http://putojeferef.rf.gd/9844161158.pdfIn PDF document text
    • http://wapemufabaloni.rf.gd/cours_administrateur_systeme_linux.pdfIn PDF document text
    • http://boxijekew.atwebpages.com/how_to_cartoon_yourself_in_photoshop_cs6.pdfIn PDF document text
    • http://kozawagoborav.rf.gd/62292901961.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/eso_bloodfiend_vampirism.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/hoover_floormate_deluxe_hard_floor_cleaner_moondust_review.pdfIn PDF document text
    • http://rovikejovejoto.rf.gd/pennsylvania_federal_government_hotel_tax_exempt_form.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/analog_integrated_circuits_books.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 5192 bytes
SHA-256: 124b18df62131b636a034355748ee51da36f9d604cfa9a86da1965bae948dd62
font_01_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 11032 bytes
SHA-256: c6307a19a7ff29c334484b1e65251c8d8169fcf459d95ab31c207492536f63bd
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off0001396d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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