Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dfc7f015ef5149…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 13:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67cd6a22fcd5ab6deef49616d9a2d5f7 SHA-1: 7affd00243805da70c8a69b6b9abcc89a42136a7 SHA-256: 05dfc7f015ef51493d59f09d71e75d95153210f4af7c9ed7943fb000c199a33f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for distributing malware or conducting phishing. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=robux+generator+that+actually+works PDF link annotation
    • http://czytamzezrozumieniem.pl/userfiles/file/21319954998.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/64464931867.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130815222fdf---72694927159.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/96840241174.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/34296806083.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/6869928459.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/702869868.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/pabifosemulelab.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/vemokujifugofinap.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/jikan.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/98865708354.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/kimenegagoxosizejokatawa.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/88473890055.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/xosizeboxa.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/vewovupulugedegedenedoda.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/57735716562.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nb4rnnbr8dpkcql8of2rf7ubi5/kewow.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/bepigesoxalibivesazusirem.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/xararagababoxikozulibatol.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/lilasogapugoronaxef.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/gevofosataxa.pdfIn PDF document text
    • http://poorclarescork.ie/images/63081539743.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/dasolixi.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/lawerijalenuzajomox.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_off0000b348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 11096 bytes
SHA-256: 5541cd830ca1a1f152fb8bf9e0ea1f524aaf698204bed5dcaa22dde1ab927460
font_02_sfnt_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 15428 bytes
SHA-256: 836f9a60aad6bb43bdbfa69ad9bb1665db82fa8f36c07e8a125e0f9938ab57ef

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