Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4248d10ee88b20…

MALICIOUS

PDF

105.1 KB Created: 2021-09-17 19:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3fab52660108a11fb5c3b90ef32e39d SHA-1: bb8d3a2cfa6f56f9c5f1de877ddc42f342d74853 SHA-256: 4f4248d10ee88b20d87c3ac8d256107eb20aa7bf9629ee54adec6868e616f3b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or distribution network. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a potential SEO manipulation or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://gilbertems.com/videos/file/nebinufopo.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/ramudolerima.pdf
    • http://stilna-ya.com/_userfiles/file/34857268239.pdf
    • http://bkht.vn/userfiles/file/buzilabonotakupalasaf.pdf
    • http://resurrection-life.net/userfiles/files/sozoloxarudiwudosugeze.pdf
    • http://pekbdt.com/filespath/files/20210909152056.pdf
    • http://eprdel.cz/userfiles/file/23895991221.pdf
    • https://estoniapools.com/contents/files/puluzefatazugajutenofel.pdf
    • http://wecans.net/_UploadFile/Images/file/96635866835.pdf
    • http://ktcz.eu/files/files/xuvepopav.pdf
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/72130250608.pdf
    • http://casaledellasignora.it/userfiles/files/16922599289.pdf
    • http://jenan.com/ckfinder/userfiles/files/94304651136.pdf
    • http://kossuthdigisuli.hu/userfiles/file/41528978220.pdf
    • http://veterinariacomportamentale.it/userfiles/files/8814731154.pdf
    • https://egyptsuntours.com/userfiles/files/dusalesokamutobapedetuk.pdf
    • http://theponghop.com/upload/files/4868462049.pdf
    • https://norservis.com/files/files/gadaxelikujivatenawoz.pdf
    • http://zhuxintrading.com/uploads/ckfinder/files/20210909/16311254249871.pdf
    • http://makrostal.pl/user_images/file/71250196109.pdf
    • https://pasarangroup1.com/contents/files/26338146578.pdf
    • http://akifkasaboglu.com/esatfisek/images_upload/files/14724166247.pdf
    • https://vyaspublicschool.com/ckfinder/userfiles/files/70184111475.pdf
    • https://zlataraburmevuckovic.com/files/96243703441.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=winner+list+of+indian+idol
    • 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_off00013839.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 16792 bytes
font_01_sfnt_off00015050.bin
b0293beeec25a0128f09a5cbc8a906159409a64f0fcaf25cb5e7234554e8a9b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15050 10340 bytes
font_02_sfnt_off000167cc.bin
f23fb0469216a0107af3b52e51ef7083db5c9cae6855fbeff9f5db48ef207525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x167CC 18024 bytes

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