Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0e4c807b6e62f1…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 13:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84ea42024b7e2ebcc16015036b642b10 SHA-1: 2a41991ad64305f4f3db15351d317cdd6f063604 SHA-256: fd0e4c807b6e62f1e04b6b99772281d6829c1e93bb43b0f0a493896f22601181
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=roblox+anime+fighting+simulator+codes+2020 PDF link annotation
    • http://sattosushi.com/uploads/files/paputewakevutagovak.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wopivedonaziwipori.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/ruxexidimixa.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/mezebiki.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/riwoz.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/xelozirenawenuj.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/konerusetuvejosog.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/43977909989.pdfIn PDF document text
    • http://profstil.az/userfiles/file/devolopodonakukagiv.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/70237793365.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411828b07f3---16322684556.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/sufiteridafefewo.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/wesazexupolatesofijemuje.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/13156412524.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/37256784692.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/likipesus.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/50757777588.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/95344889209.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/77307559612.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/50842994892.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27536984848.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/7406892803.pdfIn PDF document text
    • http://alcantara.cz/data/file/20599201050.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/52017190900.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://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_off0000b596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB596 16652 bytes
SHA-256: f6b4231b1f451ff83537c9ed7c675192a423d05279189838e4a523e3eeb73d67
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 11552 bytes
SHA-256: 0cd4c4e74694a7b6f218a1f33fc1c9643696e73d28f7a2dd0362fe29aecd7c03

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