Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c43532d01ccdd21…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 20:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09c6508a7d1aef660dc10485d2c1b2a8 SHA-1: 3438d1cade47ef70a84113cf297b0a1f592276b4 SHA-256: 4c43532d01ccdd212f80ea1a8429cac1c6ae9d1ed033328dfde05661b26c69fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, with one specifically using a 'utm_term' parameter suggesting a tracking or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=how+to+disable+incognito+mode+in+chrome+on+android PDF link annotation
    • http://xboxheerlen.nl/userfiles/file/videfu.pdfIn PDF document text
    • https://auto826.com/uploads/files/34230171333.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/48464531913.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/57098907936.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/87659327806.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/40217743862.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/64536947061.pdfIn PDF document text
    • http://jucal.es/images/file/39154816896.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210904013317_89xz5j.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/somevike.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/77877230785.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/kajulexetodi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/tezafaladisezurizedakut.pdfIn PDF document text
    • http://balone.net/_upload/file///27980219873.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/kofunezupe.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/jusagusosimasimalobaves.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/bakukimozote.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/45785248302.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vuxozaxidal.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/fojavuzebobirosu.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_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 18760 bytes
SHA-256: 2026581d99c40bec2bdb2623f27d84b3e7b70068d7cbe981fc15025c6ccbd8ce
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 11032 bytes
SHA-256: 041ff375e6ecb33eeec4578259bf6c91b7be7f2fa2aad18ecca9f7589f2faa48

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