Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8587ce843fddc6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 00:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b361c1c42bf6cea895b5d1fa5e287955 SHA-1: c08a60e91cb2d7bfbcb314fb42393d8cc0ec10c5 SHA-256: ff8587ce843fddc6920f2d4eacceefeaf5e5841e1478e1702b728734f3ef6f02
166 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it is a link farm PDF, with many external URIs pointing to potentially malicious content. Notably, a 'Clipboard command execution lure' heuristic fired, suggesting the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.bandungmesin.com/file/sinutomezodirekodimenivo.pdf In PDF document text
    • http://mosvag.ru/img/lib/file/jipufupizabamuwaluj.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/20328905454.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/zekuvasofol.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/95649519614.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/82623344127.pdfIn PDF document text
    • http://asid.rw/userfiles/file/25109977919.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/giripemi.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/zaxemorezeguparib.pdfIn PDF document text
    • http://iphysiology.ru/upload/buvofelogaribetijil.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109041949444287.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/ruxabe.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86085459404.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/jadumenodagaxav.pdfIn PDF document text
    • https://digireg.com/upload/56840757850.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kuwunaxamodi.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/putepotugewefiva.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc77f886fa---73591618597.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lunimifibexikozifibosumi.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/85931288986.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcf6b2b6d---venesoropavoxasedomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ayyappanum+koshiyum+torrent+downloadPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 11032 bytes
SHA-256: 9cc1a9e786a0f7b92ec7ab4f9ce657f296f662d2129f438392f1d9013c0c6f18
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 18248 bytes
SHA-256: 5fd089d3ffb30108e584e61f85176d5e9c40f184bd8543a17c814be52dc37267

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