Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f980458161e693…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 14:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fa6026784c34b3fc50be4b05268b870f SHA-1: 1fb0273cda87aba0f82f915522f70939035bc9f1 SHA-256: 62f980458161e693d08cadb959e05e8b104c3ba47b5f4b90196611a09ca5c1f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.gamylai.vn/uploads/files/85319746364.pdf In PDF document text
    • http://cameradungphat.com/uploads/files/9525267362.pdfIn PDF document text
    • http://evola.it/userfiles/files/xulumapirigolekobopuwezib.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/62037515594.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/junekevexibogedik.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/senatetofixe.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/ribitirexix.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/54787837001.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/wukogufenosefofomukixuzan.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/perefelefejazi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/99a3659903d8ab2ba57f5bcd0ef67364/bebaxufo.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/62301360596.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/femokozifem.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/vagexav.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210913002928064.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0b7d7bed---93207863117.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/73472355337.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/1383035729.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/9395156083.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/26465955268.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24088018573.pdfIn PDF document text
    • http://dd-eng.com/files/files/67163785597.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/68838565267.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/taruxekujobadup.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/28272471329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+install+mod+in+gta+san+andreas+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_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 17284 bytes
SHA-256: 815608e3213bf3b8aa66c054d4f857ca2ff5f32446eadf0bb5aebd393a4d981c
font_02_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 10668 bytes
SHA-256: be5d8e9a3e26d6454701dbdb14d0e2b21ca5ffafd014b1f8ae5810d54af8d8ce