Malicious PDF — malware analysis report

Static analysis result for SHA-256 5954c5d7034293b7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 21:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 20ff87f4d770d0ac6f7c9fe88988b088 SHA-1: bdc070b9cbf7a9ee5dcf14754afc9f21f7890305 SHA-256: 5954c5d7034293b7db8d031c73d6cd3d2a36613e69d0c010461e14f8d7444331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm with numerous external URIs pointing to unknown PDF files on various domains. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic suggests these domains may be disposable, increasing the likelihood of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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 http://www.hangmandigital.com/files/file/zotojawononokazexigego.pdf In PDF document text
    • http://jurabos.nl/include/editor/file/18415723998.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/kuxozox.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/39790651329.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/60329016839.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/12655438885.pdfIn PDF document text
    • http://inica.org/files/file///39343312704.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/tuzurokumezogi.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/28456705978.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/pebamibem.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/renumojopitakom.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/91197298976.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xijijaxumaxu.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/kilobezisip.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/verokuworurasaxuwa.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/31598478383.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909160806_73525576.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/35332421091.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/feripogubulidos.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909054438.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/xovekevojaziv.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/lesirowadabepurafixi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614175b4d7762---wekixofudonatigina.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/49247515950.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe3ed0bd7---pamigaxavipafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=explain+application+software+with+examplePDF link annotation
    • 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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 10916 bytes
SHA-256: 1f02d92b707f63e963f0c8c63ed277690c07b0c1c2bfab3daa91601a82a08876
font_01_sfnt_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 16476 bytes
SHA-256: 2ec308bc2cfbc558417c4addcdec8e9b6a074ecfbc7dae3e3a4718474b2e887e
font_02_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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