Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddc8b70c683b502…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 14:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06fe596d09e328c54b4a5e32acca304c SHA-1: 54d83d8d84bfeab617274447ae333a4102f3f3fc SHA-256: 8ddc8b70c683b502c47ec090d6f1763e089ec09c4133859801019ff9ef9fc5e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to suspicious PDF files on external domains, suggesting a phishing or malicious content distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/gazunabuvulutufowozemulun.pdf
    • https://autoskola-scp.com/files/sodojudijum.pdf
    • http://flynewsletter.com/uploads/file/86945183753.pdf
    • https://hr-serdahel.hu/images/file/28232316057.pdf
    • http://vatlieubaooncachnhiet.com/userfiles/file/basokuragobelifekirose.pdf
    • http://vvk-wiedermann.at/userfiles/file/89184351724.pdf
    • http://sgrappresentanze.eu/userfiles/files/memuna.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/13765768300.pdf
    • http://tunglamgarden.com/images/fck/file/voruz.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/67855029752.pdf
    • http://chinasoftcore.com/userfiles/file///suxejeni.pdf
    • https://mimpidia2.com/contents/files/93449485807.pdf
    • https://weboonline.com/ckfinder/userfiles/files/89037967905.pdf
    • http://jinshi66.com/uploadfiles/files/xazuxesokosinedadebemujez.pdf
    • http://tcsklife.com/filespath/files/20210905233159.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/8368293362.pdf
    • http://pvvc.cz/files/judisexenu.pdf
    • http://nato-denkmal.de/uploads/file/vewudafefoveto.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353b6af388d---23889473437.pdf
    • http://giovanniseneca.eu/userfiles/files/31961624826.pdf
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/41320957156.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/pro9epb73q0qhietn96htkond2/81567614.pdf
    • http://antwerp-reefer-tournament.be/argt/files/zarabitajaxukolavibuvis.pdf
    • http://gestioniarmatoriali.it/63590489427.pdf
    • https://ibshospitals.com/userfiles/file/86237250021.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+fancy+pants+2
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d139.bin
b3c18dc2731f629e30ad048ca288872c5ffb5a1f423b884f65925a86910a1634		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 10416 bytes
font_01_sfnt_off0000e8e2.bin
c58202db9fed19b940007b35a1de27fc3155c5c5c1674c4e4d673d83d1949269		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 16960 bytes
font_02_sfnt_off000114e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes

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