Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29552508f2a8a51…

MALICIOUS

PDF

71.2 KB Created: 2021-09-22 18:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aebd193fb254caca976fd8d96fc22a0e SHA-1: 1063146621f4927581d02902e5d025d35d87c1de SHA-256: c29552508f2a8a5193c868d0b06a8b45d53665aff34c7e09e99098c266676cde
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://peter-scherer.de/userfiles/file/114356634.pdf In PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/14145024900.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/80099207895.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/pemazewenebizida.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lomevewinoximafenixeta.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/mafagesuxutesadedutubuv.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/romujezodegaxab.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/38063285267.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/gusakutowijuputo.pdfIn PDF document text
    • http://eksternest.be/images/file/72725035247.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/vagugupajuzavuwikan.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/292098029.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/75360078235.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/77602614759.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/xipegojuwosiki.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/babojebidulabogibe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0c78275949f0d18df42b61ab98fad1b8/zamuwen.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/oc0p11opsav0r3qi27e31hu7hh/pefir.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/saxitututom.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/70297418939.pdfIn PDF document text
    • http://stringladies.cz/userfiles/muxenebabafulakokizomoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+login+application+with+mysql+databasePDF 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_off0000b35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 16204 bytes
SHA-256: ef52a1a930db182604b55a0c0f03593ba71feee5fbd66f4c47bb74c7d2aab511
font_01_sfnt_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 11428 bytes
SHA-256: afb11eafcad5e8b5ca1cc336be3335484db028133cfc6606e82cd2b2f1b63637
font_02_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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