Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c2e989937f387f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 20:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 27bc42505829ad1992458447be95b8e6 SHA-1: 5da7d46ba1df4d086f21e15f20ead6dfc9ec5060 SHA-256: d1c2e989937f387f5de90fbdcafc84e1ecf67110dd57689a157dada5d9387a3d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, suggesting it is part of a phishing or link-farming operation. Crucially, a heuristic indicates a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. The presence of multiple external links and the lure strongly suggest an attempt to trick the user into downloading and running a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+install+apk+on+mi+tv PDF link annotation
    • http://biblioteka-belzec.pl/upload/files/76481588681.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/keneranepudabezapo.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/jerulixafexivubabim.pdfIn PDF document text
    • http://hopkim.vn/upload/files/60717069615.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/makefux.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/wafupo.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/81008870498.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tekirediwiberogofonu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a588ef717---94563079241.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/lifekuxu.pdfIn PDF document text
    • http://ustunongel.com/image/files/nujibimi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8ntksvl6rjgtl8bp8t5aefqcj/tidaligusomodujetabu.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/20654071304.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/jiberigajejeretufon.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/14936181632.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/poxetodizu.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/37064706429.pdfIn PDF document text
    • http://imoroz.by/upload/file/pofomuvajidav.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/19648373514.pdfIn PDF document text
    • http://finchamauto.com/pics/kabaxorux.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090307504628.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/81540956517.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_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 18144 bytes
SHA-256: a12602edb73aed9fd8ae0c6450119ab28db459b8bc0a4abc07270b02803318cf
font_01_sfnt_off00010d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 10416 bytes
SHA-256: 75d9697011f5f183f19cabfadec4770efb2d521d4bcc0a9d21deb223b8c65895

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