Malicious PDF — malware analysis report

Static analysis result for SHA-256 29cb091a51f3e7b9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 06:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9cf9df43be0382439351c42606dce536 SHA-1: 221bb7e631e72363d58576e518d9bee221ed9a8c SHA-256: 29cb091a51f3e7b94b31aadfaaf3feb7867c8e18330d8382e5fd5ac2992aef11
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous external URLs were extracted, many pointing to PDF files hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca9a4d334---wikepiguwubi.pdf In PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/10621252413.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/fibaxumeten.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/72281154830.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/wetalapalapozefurolesexu.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/lepabewewiv.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/80084224857.pdfIn PDF document text
    • https://telenovella-bg.com/files/lufupojofuladakosu.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/femusifuli.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/47690552229.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/78519481365.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/fusonekapadolotirukem.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/tudixanamadavo.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/natazapizesitixeme.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/78424761540.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1fed293f---53505329342.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/rogimekanidi.pdfIn PDF document text
    • http://195exim.com/datas/files/36575463474.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/xegegubewamazemidinobe.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/78918865818.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/wedawovomefokolememo.pdfIn PDF document text
    • http://idcla.net/upload/files/xojolifevedelimoj.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/saxuxegalitamiwenut.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/fisikaminoliwim.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/siburikemazofiwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2018+vidmate+apkPDF 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_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE071 18052 bytes
SHA-256: 255294998a37d72cbc4c1ebc2a52bf3a8d7b7da4a822c5465b699a506b0872e6
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 10576 bytes
SHA-256: 88e4d3c8bf93766446ea11e0826ea53b7c8c9e12314a6f225d2a2ab55bc99464