Malicious PDF — malware analysis report

Static analysis result for SHA-256 940059630a7ea6a7…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 19:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7866e5e167396598b645bf5e4e5ed511 SHA-1: ab8a23cec3e59ba15584894ff3a35903261d04f7 SHA-256: 940059630a7ea6a7476de9d0c22593519c7229649d29f0fc209f70627472f177
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, suggesting it is part of a phishing or credential harvesting campaign. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to interact with the clipboard to execute commands, a common technique for dropping secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=how+to+turn+lock+screen+off+android PDF link annotation
    • https://promaxsuspension.com/csmimage/file/22262748994.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/9944557645.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/41320678798.pdfIn PDF document text
    • http://esejsc.com/upload/files/vagoki.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/15209968485.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/7f299d6b694eeb1c5d8a5e88d2886abc.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/wapazub.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/lavonaponumowetobow.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/72395479464.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/67920387637.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/tebetafotor.pdfIn PDF document text
    • http://humanlitech.com/files/files/janezumiturojodotetijiri.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetilelij.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/17895879551.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/xekoxefejuvudunoronoma.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/vaxezorazikozijimosede.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/kegetumagawefidas.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109081212332698.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/66995671590.pdfIn PDF document text
    • http://biosite.ru/images/news/file/22109624224.pdfIn PDF document text
    • http://naviway.su/upload/files/gosojuvipoxobawiguvama.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 18652 bytes
SHA-256: 73de2cfcff58b1caf80831060e0f650605488d63c4470794f26e3e9af5ba085f
font_01_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 10740 bytes
SHA-256: ea78c6325fcaddaf10a8421bb18c08c22a8b604921228850c47af9dd3935debf

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