Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9cda317756976b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 21:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ccc6c509856b132a1287813f1d622da6 SHA-1: 24d3ff416105afc857744e23821ffd18a71959b9 SHA-256: af9cda317756976b437fbeacce1a6adf82b51adedca3d9bce90e72edcab90fd7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged by ML classifiers and ClamAV as malicious. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing secondary payloads. The embedded URLs suggest a phishing or redirection attempt, potentially leading to further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://drafthe.ru/uplcv?utm_term=how+to+install+thai+font+on+android PDF link annotation
    • https://idea-web.ro/app/webroot/files/userfiles/files/jevotivufefobosude.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/rokebowurarumamev.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/43763470945.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/jafewoderelitaw.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/lubumiwep.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/33010221455.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/58987706222.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/vitezajamuvaduvaki.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d1856d10---58312973263.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/mozagufasuzukagugupede.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/39044639030.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/mafazitefokenuvinuvabaw.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909102450681515zsyya.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bororajuromiwupesufud.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/gususakenulopotenejijir.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/69550357237.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/76864373640.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/49346726283.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/joxuwene.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10178414579.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/79902239737.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/32963741834.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_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 22056 bytes
SHA-256: 16df6574198d1ad863578a8a59f424e690e273e558b73e8929cda6a764015c80
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 10396 bytes
SHA-256: 75274cbaa8ac10624e90a87c79d39fa8d09f7cfc716709f63ef5ca8ce7d10ea2
font_02_sfnt_off00011c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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