Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44e2c1d61b0b7d0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 06:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7180984d684239026b9ff61ad47c345b SHA-1: 342705ee74f21405917ba92a563ea7a68e0b823b SHA-256: a44e2c1d61b0b7d00ca9a4e90656a250b28bf0aa8144d5fcabd7b80a9d8d5870
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious sites or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://splogservice.ru/content/files/42741762214.pdf In PDF document text
    • https://euroroma-bg.org/files/file/larujorenojekir.pdfIn PDF document text
    • http://vpsystem.com/files/fck/rutodowugidarow.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/17345131766.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c4879dc8f0de7e04e452b1260098fe9b/megawilovopopefaba.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/xanibomatududu.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/nuzexodetajetegosorit.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/digojaj.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/zabexixabev.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/limekoberapika.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613352489718a---4763671403.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/94273905173.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16310435021897129383.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/61588194021.pdfIn PDF document text
    • http://rc-modeller.se/images/file///zomekabidulogiwakigu.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/nazalaxow.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/nabizotojovakapagifesovi.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210902151654.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/xawuxeg.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/xifefezikijawuzuvagadeke.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/foxemadorinobevatinika.pdfIn PDF document text
    • http://laduses.nl/image/file/71407932093.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/paduzafowoboxilisoje.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/pizixalusigefiwejaxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=asphalt+8+hack+apk+modPDF 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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 10632 bytes
SHA-256: 749548ab649418257de3baf4c3849f28153dd84240e7af5441daf8194cece84d
font_02_sfnt_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 14868 bytes
SHA-256: cac58a8cb37146535b1cd941d3a8de0f9d9b634e86428787fe85914a76af4010