Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d7b2c5833da446…

MALICIOUS

PDF

79.3 KB Created: 2021-10-10 03:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d826c41c1eb4a26947c3b73e2b694f5 SHA-1: cffbe974d56e33c6cd8d9a68c63cfb175fe1b01d SHA-256: d0d7b2c5833da446554d7240b62ccdaeacb8c7bc079934c4ca6ab37863387901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=note+reading+exercises PDF link annotation
    • http://madmojo.com/fckupload/file/2194782712.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/diwitusefarun.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/22969776471.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/zexalabuvimaxipuzitiludu.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16162358b15e15---ropubitelofe.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/vesafedadodugejijek.pdfIn PDF document text
    • http://tencanpowder.com/d/files/93538442877.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/kevixidumebujel.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/fazabujenid.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/wuwusunuzuviw.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/24760205090.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/44273053929.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/tufexifas.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210917_F4318FBAF07E3CAC.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/38105327642.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/sabaxarasojunetawe.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/64606726855.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/ronevutojurujiwikapefejum.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/40943185056.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/niwipuwar.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/juxefasoxupuworedefu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///23234090311.pdfIn PDF document text
    • http://arsvet.ru/img/upload/54704292468.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0b1e089c1a3e1a490e2c6af0256cfde9/72734871137.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/jariseximosuxufeluzired.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_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 18792 bytes
SHA-256: a873ba0251d4eadaa23bc143396fd3e2c43dcdea4d6a6a67e68c252da206b529
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 10576 bytes
SHA-256: 6eda94154e6141c916a1c7b3ebfbfc1639962c05869a360f8a3e825057e5cebb

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