Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d36fb7393005c9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 05:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 025a63b258a7be26e6faa32a2eb1e0fa SHA-1: c229ccb89d09f899a917c5fae6b1779845f8a385 SHA-256: 34d36fb7393005c9d9cf205993f66920193c94e6f5b879453cfd8182de549683
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. It contains an embedded JavaScript stream and multiple external URIs pointing to various PDF files hosted on potentially unrelated domains, suggesting a coordinated effort to distribute content or malware. The primary intent appears to be directing users to a network of linked documents, likely for SEO poisoning or to serve as a distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=spiral+of+need+read+online PDF link annotation
    • http://donateagift.eu/userfiles/file/8510334064.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/muweposedetevugiden.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/kuvukewunuvixepaze.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/20998655876.pdfIn PDF document text
    • https://windscrm.net/files/file/vakebajumodisafoj.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/xuvupiwufozagazirawumu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4bbf419d376dfa7a8ab484fc6f89bf3f/59754300169.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/56225682188.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/wexukav.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zewiparibexaj.pdfIn PDF document text
    • http://axwelindia.com/uploads/52465944578.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614023299ae56---99184046050.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210901_317E393008A050AF.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/71286081703.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kixoz.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210910182631.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/31387408331.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/wipex.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/88007053203.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/pedunum.pdfIn PDF document text
    • https://kawanmto.info/contents/files/poserulotogovalev.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/daginofeka.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fujeronisak.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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 10300 bytes
SHA-256: 5563e371d63788487a79c750ea946cb3c73b09120a2861531438855c8dd000df
font_02_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 18328 bytes
SHA-256: 7e56f5a2358c6a4fc5e74345a9d833b7ff5b70fa81cd2562de77effdb6e42e69

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