Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e76a5a0617bf0e9…

MALICIOUS

PDF

78.3 KB Created: 2021-09-23 12:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 77640d456e78ef793df480dd36b1f63d SHA-1: 0b78fd75fd50bf9a411b6f9d56ee9dc41f27abfe SHA-256: 2e76a5a0617bf0e9edbe5f72590593ce041621e11f6ab7e5a1b0b57c0a2f1524
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, including one pointing to 'huntic.ru' with a 'samsung_android_usb_driver' term, suggesting a phishing lure. The PDF also acts as a link farm, directing users to various other PDF files hosted on potentially disposable domains, indicating a multi-stage attack or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=samsung_android+usb+driver PDF link annotation
    • http://take114.kr/FileData/ckfinder/files/20210902_7DA73AE098425BEF.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/xavuramiji.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/forajasoxesale.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8128720e85fc8d64411842006b1fcedd/86890701515.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210914_5B6BF700947FD2B0.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/vofadalatileje.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/xamugokupugajepobo.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/moribuvo.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363bbf904ab---gutafewego.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/zevutukanu.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/sifow.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/famesefok.pdfIn PDF document text
    • https://linker.tw/files/rukujotezigoz.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/dunilasawovif.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/lemovofutavetasat.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/dolulalagibos.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/buxil.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/17899944868.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911044330.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/kegejobavisunaganazoz.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/jujafodes.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/ralenos.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/raxanopapuridividodeguj.pdfIn PDF document text
    • 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_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 16860 bytes
SHA-256: e17eae15cfb72178b5827e12c2fd8c652f82ecf22982b494d9a44e01f3917e5e
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 10860 bytes
SHA-256: f7ddcc7300188d3ad350468060d8ab7fc1aae0af1841d2cb42e630319580d26b

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