Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5524d3e641562b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 13:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fe72553dddc11c698ae27e9232df4fa SHA-1: a59cca4e55c6c83207e2a181390ab4200f0a88e8 SHA-256: dd5524d3e641562bbf6c23840634fca92ec8036617c398055509fda78c404b80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains or are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic of using disposable hosting for link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://motocams.cz/ckfinder/userfiles/files/tepes.pdf In PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/33813569694.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/61517352074.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/litetuwib.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/sexumaxo.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/kakijimudukigul.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/95574253506.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/xugamajasizi.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/kuzogikodogubiwepife.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/nizimipimasogoluvad.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1d65328b76e1e54b7d0f02102f4e5e5e/rorijiwodupakuji.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/51561974688.pdfIn PDF document text
    • http://cabini.it/userfiles/files/57118610588.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/21598633851.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vlg7pnr30c4mc9oirl6cbobkg8/92131508234.pdfIn PDF document text
    • https://anjingliar.com/contents/files/xinodotitobikisew.pdfIn PDF document text
    • https://12shio4.com/contents/files/47578720053.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/47730148152.pdfIn PDF document text
    • https://fptica.ru/images/file/dapetimorelokutalu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/dupugeminanudutezuwavag.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/kuburonasibifexi.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/61139942022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bloxburg+modern+1+story+housePDF 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_off0000b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 11000 bytes
SHA-256: cc3aeef3a6a63d1096298d089fbe721a61d9c2265ed270e9bef569eebac3fcb6
font_01_sfnt_off0000c9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 14996 bytes
SHA-256: 73b39dd4f081a3c52ebddc9611ed7c7e8f8fadabafade2d1292950f3bf2f368b

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