Malicious PDF — malware analysis report

Static analysis result for SHA-256 c954e97cbd86d1d0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 00:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 961d194a6f066381e0c3e49350b428e0 SHA-1: 561ea2137db879e833c9d8f3521a4de3f6c44c02 SHA-256: c954e97cbd86d1d0b12fe6b9c0881daf27aa3a5ecb71bbb0f5e9a80981fe16db
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, with a primary focus on `https://dugedepap.ru/award?keyword=graphic+design+portfolio+samples+pdf`, suggesting a lure to a malicious site. The PDF structure and embedded content point towards exploitation of PDF vulnerabilities to redirect the user, likely for further payload delivery.

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://dugedepap.ru/award?keyword=graphic+design+portfolio+samples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386851/normal_604142d35735b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443344/normal_60240a3c4adc4.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/simple_python_programming_questions_for_interview.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5fe56b8f39fee.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/ahaFtUs/9146960223.pdfIn PDF document text
    • https://cdn.sqhk.co/wedowetaso/gijcibb/red_and_blue_jordan_10.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/cpHLhig/instant_drag_racing_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/kqyHDib/animal_crossing_pocket_camp_gift_icon.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/6hbifih/xigimubirezarolaku.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fkR3fUu/61098569910.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502436/normal_5ff8027360e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_6047696ec04b6.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/fCghDic/endless_prince_run_in_forest.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5ff0e140107e9.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/bazenibew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibozaxasoloje.rf.gd/58658899618.pdfIn PDF document text
    • http://xusoloturokuk.epizy.com/canoscan_lide_110_full_setup.pdfIn PDF document text
    • http://kivevufawonin.rf.gd/zasodiju.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_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 5600 bytes
SHA-256: f290b82a3ea668b5410a5c9b6428f71a8a1646366ffdebe7a685d62356599afa
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 10344 bytes
SHA-256: 8be190aa298003cc5c5c00688df82019f4ffc47c4f0a080f30a5f77d95b7982f

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