Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cfa94759892cfa…

MALICIOUS

PDF

92.2 KB Created: 2021-09-12 10:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: beb0bd701ac49de88769bb5260099560 SHA-1: 310ee0d740e41d221470397bad8ade827a3abc0a SHA-256: e9cfa94759892cfa177c8c2f441ce07f76dac4617255503016c8415fecd02369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to lead users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://preprodpcb.com/userfiles/files/52016228503.pdf In PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/67824448407.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/92977516708.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/94140821592.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/jipaloj.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136bdfdbf0ac---penivuwijugazu.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/46608236198.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/mudopifefegavut.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/dixurewurilevalopusupaza.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/vilosarupobobuta.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/josafagipipewore.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/99251778735.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/31960188065.pdfIn PDF document text
    • https://ewt.cz/res/file/26095266856.pdfIn PDF document text
    • http://52963566.com/upload/file/202109082332566604.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/nedejoravig.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/49190275506.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210911045600.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/96612163935.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/wowadigitupaxelubodub.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/10187497334.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a332a2e04---duxenagiwarakut.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631279787.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/jogixamijizefewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=among+us+2+play+onlinePDF 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_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 10712 bytes
SHA-256: 9d7f50575fb044df0dfa842b91c7109d773d0357ab366d8fa1e7153681646f94
font_01_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 18828 bytes
SHA-256: 2ea441eab83fa540000d375c9cb1a77c5d3b11afeb62842b85415767c84f45d6
font_02_sfnt_off00014b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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