Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d31ba8126cdbf49…

MALICIOUS

PDF

80.4 KB Created: 2021-09-14 01:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65f12e16dbdc1cad088013a597c42540 SHA-1: 0bc5baa974f14e983dc33ad08d5654dba49fe9ee SHA-256: 2d31ba8126cdbf49718d891cd0e894a9d6974db7658333f8989a6459d21c8bb5
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. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tischlerei-schlusche.de/sites/default/files/file/20554355741.pdf In PDF document text
    • http://duhochoangthanh.com/upload/files/69095144930.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/94627467241.pdfIn PDF document text
    • http://espokebar.com/uploads/files/75517742015.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/88376389475.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/wirakuvobosarufuda.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/4538045498.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf656eedc---15611661212.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/riwanubipudufemubuzufod.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/81512475874.pdfIn PDF document text
    • http://regcureguide.com/files/files/bekamomovixuvi.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/gekajukapi.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/kovujizixesonin.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/nixufad.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/masudiwumilaxoseruxaruke.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/53186133046.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/gowekidugokijabeza.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/18329770317.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/56123185116.pdfIn PDF document text
    • http://hrudolf.com/userfiles/88075677240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+pictures+from+samsung+galaxy+s5+phone+to+computerPDF 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_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 11596 bytes
SHA-256: 70a9385386b830d5607e667e9afae315d9e278a831816783da45b8a44e48c9d8
font_02_sfnt_off0001049c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049C 18132 bytes
SHA-256: c2ada842a22537ed6198906058489fe1c429fbf71eba72ee8b0a260142259ed9

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