Malicious PDF — malware analysis report

Static analysis result for SHA-256 499c2d0cf97d7b0f…

MALICIOUS

PDF

72.7 KB Created: 2021-04-28 10:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f085183613224588e0724c3466fe0147 SHA-1: df874f9d397e19b4849428ce1ebd1546f4bbb334 SHA-256: 499c2d0cf97d7b0f2b32974f638018cd4114b365e16b1032aa523566760c5afa
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

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 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://seumenha.ru/strik?utm_term=vernon+howard+interview PDF link annotation
    • https://cdn.sqhk.co/fodibaniwe/TSjjz2r/kodiak_cakes_recipes_waffles.pdfIn PDF document text
    • http://tizeteleke.22web.org/dv_lottery_photo_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/gcChiZg/98798478422.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hNo0jfu/60669601531.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/VRLNSCq/93795040538.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/gB5SgeI/muzixijeko.pdfIn PDF document text
    • https://cdn.sqhk.co/mebosuxular/vFjbhjH/virobatulagoz.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/icjcGha/tufakiwugudogeza.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/hjgrja0/airport_city_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/qoicjh9/music_id_app_free_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/ibgdJjb/deep_sea_creatures_bioluminescence.pdfIn PDF document text
    • http://zegevuk.22web.org/lupenikepetefuvokibupip.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/ggneybH/mafedusedesola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topajikof.epizy.com/vipijukibonebebiko.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/attendance_management_solution_bahasa_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/44863402758.pdfIn PDF document text
    • http://tojizevujodi.rf.gd/honda_rebel_1100_review.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/css_stylesheet_text_color.pdfIn PDF document text
    • http://viveguwoxifug.epizy.com/drill_3_4_hole_in_sheet_metal.pdfIn PDF document text
    • http://xafopomafox.rf.gd/12338402447.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/jobemokuja.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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 4820 bytes
SHA-256: 393eaeef7582790f58fc296e7b5b34f9d4b7e5703b2115e9ab9a627d02336aed
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 11860 bytes
SHA-256: f67256ceebcb5aee6c70faefaa977fa1ced363ff9932e4e6d5ae3cfcd666811a

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