Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31aef088d2ca224…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 08:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8daa6d9a07a64e6cc403b61a6082a6d8 SHA-1: e47af121debcebd4e1a1f7334af1c11734b28e80 SHA-256: f31aef088d2ca224e558e47277b430d1e963ed6ca0de99f3faf1042cd0e7049c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=amelia+bedelia+online+pdf PDF link annotation
    • http://maremania.net/img_pagine/file/59862641166.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/timimuroxe.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/keren.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/jilelarozosebapagatonigi.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/xejawexesaripusoguruximaw.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/tufixolekometukiziwidudan.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/8334856775.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/26763381684.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/sorifikak.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/xonibojivawufo.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/81728151402.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/joraxured.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lizoramojemireponenebovu.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/6226837572.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/dojilokero.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901182435_drv4bz.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/fepalemebog.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/kugaworofib.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fiwedo.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/10203981405.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/81238945929.pdfIn PDF document text
    • http://gespk.com/userfiles/file/70312781401.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/69394567800.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/72641129721.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/falekilavepajekaleb.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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 18924 bytes
SHA-256: 144b145ea1bcbb47647e9f8b4d236aca5b0bd1007ff90f52d42c91664c42626a
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10416 bytes
SHA-256: 0cc4a235e8e76bcd394d547b21ce2bcc941f0dc1efce7406184196fc9cdc915f
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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