Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8254ee1592af2c…

MALICIOUS

PDF

94.4 KB Created: 2021-09-21 03:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1609f61053277500cedbabc6fc44b8a7 SHA-1: 3430d15cac39fd388e2b4bbf52d79ed6807e4705 SHA-256: ad8254ee1592af2c4e076151f7552fa2cbcc7998e3d542d269ce74f8558e0c99
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. While no scripts were directly extracted, the presence of numerous embedded URLs and the nature of the lure point towards a phishing or credential harvesting attempt, likely involving the execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://komunalno.vrgorac.hr/files/tujogagerisow.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/favodexazobizoxatoza.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/kumitejunifukula.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/18618725198.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/bosavawedusufijunosu.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/kaxoluwiwid.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/5792733011.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/datutosumax.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/68178314439.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/buvugefugegonavuvow.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210920061815524.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0d1201b5486e5a3ec762c44f6f72dad9/38481337018.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/zewuto.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/jonunuporubanuvufo.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/petepupowidagew.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/bivevamisowewi.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/ropimik.pdfIn PDF document text
    • http://na3.it/misc/file/27502348936.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/jeromegifilusek.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/29548428806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=adb+fastboot+flash+recoveryPDF link annotation
    • 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_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 19160 bytes
SHA-256: 84154e5117b1c110a740cec99bcc66d21925254d9744c4b768e70739cf43d2de
font_02_sfnt_off0001537e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537E 10676 bytes
SHA-256: 86fbc23b25980d3e73ac957cba43627a0335b557b613681f5a03ac43013438d6

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