Malicious PDF — malware analysis report

Static analysis result for SHA-256 805a5f262826a41c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 10:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c8e254aff05259133dc6c1ac6e36024 SHA-1: 63282a89ca0bcd6bfcc4ec00297eba7c23bcf607 SHA-256: 805a5f262826a41c8bd002fd7a6d741f144824d487b3c0199d90910b62dd6f76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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 are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=how+to+critically+evaluate+something PDF link annotation
    • https://cpsguffanti.it/uploads/file/16240296697.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/74449328236.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/30249761762.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/nosubol.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/jowavat.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/pofoguredesasuz.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/37790928571.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/xopobun.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5cefc9fdc48ebe7e2dc769c64a7f1645/polesino.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/78444015899.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d36de78413---resejaromuzewe.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/tifadipikadimogusobojut.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090417490273499.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/5450959820.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/lugivawazejolorunu.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/zivuko.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/ximupa.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/65993494731.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/44217589813.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/lewem.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/tepedesamasofexipolubun.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fopedudi.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_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 17348 bytes
SHA-256: 4705f583009ac066c942de366cda26a989b621e921fd3b22f1c11076f8b0f236
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 11036 bytes
SHA-256: ee94ee74898dd523286e4a541a978a907218b1c64eec33a8d71ed1156ca65272

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