Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce116ab755bb221…

MALICIOUS

PDF

74.7 KB Created: 2021-10-09 10:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a19d4041f648d47737eb6d2dea4206e SHA-1: d2f3d7187a1bc09c182e3707ef1e6305d2a238ae SHA-256: cce116ab755bb221b4ca4b8d4b66a1c8680ec72ad0ccfffca77dce09c4601534
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://osteriadelcampanile.com/userfiles/files/99933363867.pdf In PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/dusitisok.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/25949831870.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/rapazota.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/93799528617.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/podotolifivonunoj.pdfIn PDF document text
    • http://puisan.ru/uploads/file/pusomodu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/wuworinepotewagoponaga.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/medix.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/kitiruwazosoxomute.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/jeborume.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/zetufivorubepepid.pdfIn PDF document text
    • https://webhosting4.net/media/file/filabifu.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/25376187063.pdfIn PDF document text
    • http://tcihk.com/userfiles/pavimusitunuw.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/dotajixeridetofupe.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/2835059887.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/7973657288.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/51f6b2650785e3a5b3f9476053842c1f/95144999446.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021093018564862.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fobalowutovunus.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/norividokeg.pdfIn PDF document text
    • http://jsdarvin.com/files/xesonakidutote.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adverbs+meaning+in+englishPDF 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_off0000bd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD58 10664 bytes
SHA-256: 1bc3abf7c9c2f2ee94d7328166170cc6574fd0acf3e183fbded501676885ebde
font_01_sfnt_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 18728 bytes
SHA-256: 001f9d2994d1c57e5359640e06d96cfe7da95afc45a52547e66846462301c955

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