Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2d34fe8bce716d…

MALICIOUS

PDF

67.6 KB Created: 2021-02-07 06:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5034216fee33af2b45508e61e0c16a0d SHA-1: 578b6165ad9622ab47e5dc0656691356512b8308 SHA-256: 7e2d34fe8bce716d0fd5fd63421993c181de1fb15af8fb5299a85ee794f809a3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to attract traffic or distribute malware. The heuristic PDF_SEO_LINK_FARM specifically identifies a large number of external links, with one prominent example being a PDF hosted on cdn.sqhk.co. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wb?keyword=boarding%20pass%20template%20word%20free PDF link annotation
    • https://cdn.sqhk.co/xojelumegasi/gjevghk/kong_want_banana_gorilla_games.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/larabegi-xesenoxafomuno-tevemi-bavadogofemupig.pdfIn PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/0c335f.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/IhbheUW/child_care_licensing_act_colorado.pdfIn PDF document text
    • https://gapetomoje.weebly.com/uploads/1/3/2/8/132816106/778873.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/RqhehhO/knoxville_teachers_federal_credit_union_routing_number.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/xugigabitulu/crossword_creator_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/vowalibu.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/able_free_unicorn_invitation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/tikexegiga.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/air_india_booking_reference_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/wapesemexebidodupav.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/23450114715.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/45801933588.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/annual_vehicle_inspection_report_form.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_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 5504 bytes
SHA-256: 523d05228cfae6dc67c52e20f474b8430fd52f2556bf886f81ceed85b7016b81
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 10176 bytes
SHA-256: 519a6a90ff68f7eebb22768abc2c4dd9997172e8b8080ed0dc5367fc8ede0255

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