Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58c9f8012b09239…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 18:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4eab8003ed84f05d6cf5b4aedde9aae9 SHA-1: 20932a07537c0009ff29b95e250b8e318d86485c SHA-256: a58c9f8012b09239c63438a3c1f39a82d3f55b1aa67a2ba6a89fa340a884f58b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of external links align with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://itps-group.com/uploadfiles/file/86773120424.pdf In PDF document text
    • https://dursunguney.com/userfiles/files/vexabiwabowupagobuxi.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/95295bb82efb5a699cc41b3549f44d28/tomiparetakoxogekuzarate.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/23033805251.pdfIn PDF document text
    • http://edeins.com/userfiles/file/3108075950.pdfIn PDF document text
    • https://mar3ol.com/Files/files/45777210746.pdfIn PDF document text
    • https://granitnet.hu/editor_up/26650633407.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/13138550496.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/patebugisuwikuxoveneta.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/48411695692.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xuvupereraruvazadupug.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/bb3026068e3604a06d1b001b2533e216/regilazidifabozijigom.pdfIn PDF document text
    • http://taxfreepoint.com/file/zexufarutawekejevebinofut.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/43317685720.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/visofaribewiniputipe.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/2637087197.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/loxukeweruje.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tekaxinize.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/9732002602.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/96925694633.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/sezese.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/kolopebidowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=application+pmu+sportif+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_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 10728 bytes
SHA-256: 95a013ea26b9553a031f172a373c9bb061e251feedfef3eb9cee2f15fd8fcc2d
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 18604 bytes
SHA-256: 1e6e7c694b757c49c7b45ba029d13b2f42272013a09ec61eba6006a834145a09

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