Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6b2695a6d6d936…

MALICIOUS

PDF

84.7 KB Created: 2021-09-23 06:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c0b12bbe3f593431841dd5f7be6ac3c SHA-1: 047b60d6341d7857788f52530cb2ea4634e5d711 SHA-256: bf6b2695a6d6d93631fd034be616c68bf2e6c0db323d35bc5dfdf90bd2b7b475
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs and exhibits characteristics of a link farm. Crucially, it includes a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste commands into a shell, a common technique for downloading and executing secondary payloads. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=free+realm+minecraft+codes PDF link annotation
    • https://truckforceone.com/upload/editor/file/wilasuxaxupibekirijijoji.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/rekofenok.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/42128708932.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/guzuv.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b63bceufpkro608p7r297cmsh1/bumakedademudizege.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/81160657128.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/boporifutele.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/45521259202.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/59110361502.pdfIn PDF document text
    • http://nineslash.com/user_file/file/98193254646.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210909015949.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/lasuvojanuzuruko.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/xilewatape.pdfIn PDF document text
    • http://przybyszewski.org/image/file/83926168024.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/68886165215.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/90822734766.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/67826866694.pdfIn PDF document text
    • https://superpart.com/files/jupaxamo.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/rebadujadiviturepugi.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/wapupitukakosoxizuvavu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zilifejefurexolipulo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394c2bbc8b2---75292551640.pdfIn PDF document text
    • https://harom.ro/files/file/66894980926.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/jamijatojakadadifafal.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_off0000e730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE730 17568 bytes
SHA-256: 158719d205479ed228b697e6a362fb87905b22352e853f286d84ae21036ef20d
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 10616 bytes
SHA-256: b35619d6259cef4a5ec5c258387103b1550c70d5231eb4a83ef98a313c934ba2