Malicious PDF — malware analysis report

Static analysis result for SHA-256 497cec9cc0305462…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 16:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1f72a7aafb24fa1ac7ef55c40585c83 SHA-1: f10466294ed1495cf6303c8426f0b3807a6424f9 SHA-256: 497cec9cc030546269d2f8f4e6c2100c53ae3093109281da1f3745f4bc8e1b4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to redirect users to a compromised site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pastelbuilders.com/userfiles/file/loweketabopa.pdf In PDF document text
    • http://viprealestatebrokers.com/userfiles/files/kedito.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/65542284700.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kowatalu.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/gutaribo.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210909074926.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kimidupobuvazasujanigu.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/jivogerogojilebadilo.pdfIn PDF document text
    • http://decorstore.eu/upload/file/folovakemifipimujabepek.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/95854049972.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/25875903861.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zedibag.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/83860987201.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vojirafug.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/gujizusunibirijujip.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4d02d91f---92448763817.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/26887591678.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/7973949655.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/54805381317.pdfIn PDF document text
    • http://zeci.nl/im/image/livupogaxukewidud.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/vulokowatokufavalodis.pdfIn PDF document text
    • https://mahae.hu/files/files/mipijaloxud.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/p3kp0ijt1u825b3bq6d4lclur0/junimobiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=open+source+office+suite+for+androidPDF 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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 10692 bytes
SHA-256: 9a8a79504f2d7a1e857bb6de6568398077a7f3100b567b52e0c068d608bcc40b
font_01_sfnt_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 17960 bytes
SHA-256: 36fd2bfd99748b5977db1689d85d3d318a97f1d84aba388506ac76312def82a6