Malicious PDF — malware analysis report

Static analysis result for SHA-256 29901c30c3d0c344…

MALICIOUS

PDF

94.9 KB Created: 2021-09-08 20:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6d0fd9364a809153182a17f99f5f43a7 SHA-1: 0d763ec7cc56d019e8d9a2e3f9227febf9733c19 SHA-256: 29901c30c3d0c344b0dc41967e052500ec002fdc91f4f73caf9281d8a4e910c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document. The ML classifier and ClamAV detection further indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=ralph+waldo+emerson+the+over-soul+pdf PDF link annotation
    • https://akproauto.net/nbloom/fckuploads/file/juwarasiponavokavames.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/nuvoduxotajexegakoki.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/98138853250.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/97678963917.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/29557567089.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/kiratisavagewelugorufodik.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/21088549261.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/1488356267.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/83763941467.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/monetevaxewovoritopuz.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/75944783444.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/66202835378.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/99414458757.pdfIn PDF document text
    • http://apsons.eu/files/file/telutinelexami.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/monekipowajipu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e5b7c966a55a0f301180c756e7c9888f/42948153619.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/20260982042.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/75966620847.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/38425243399.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/rufafapa.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/devodagewakuvi.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_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A7 19544 bytes
SHA-256: 85a1f419ba6e3a4e127eb62b8af9e9fb3e879049d3f037dc933f110ea2122fa4
font_02_sfnt_off00015426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15426 11004 bytes
SHA-256: 95c786ab68f428b9d3974b748a58438ca6a423f3d9021390b855c1263427b250

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