Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a4ec5455ea21d4…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 01:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 158605400b0b2e8d4fb07ae3b37fd233 SHA-1: 219b0fe2d4c3aa15b74bb092e1234f54e8e245dd SHA-256: 20a4ec5455ea21d432e790789387f803e99aa3e53c6ff42211077ebb1e1aaed6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161321a5e97074---sakisewovatoxe.pdf In PDF document text
    • http://alfavs.eu/userfiles/file/43727418316.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/dijafuvefinifilab.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/27989962692.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/wakusovazinowififemipeg.pdfIn PDF document text
    • http://irinabailey.com/upload/files/72451774261.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///dobomal.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/jofezozuvikaxobijuwobig.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/xivawizijixomuwot.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/sirumuvesakalepisen.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/vibevub.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/lefatiremawoj.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/tevidukatoxigenubopa.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/vutimebazezudavexanobozij.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/9485234141.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/92650366962.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rorenojawanipapewusazizu.pdfIn PDF document text
    • https://x-software.cz/data/file/pusasoxoduvusunixideveru.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/winekutiguzi.pdfIn PDF document text
    • http://abwrva.com/uploads/files/sevinodugam.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/fisoselonajiwewipomuniwa.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/piwojitudevefurevod.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/mepoxodixitat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=car+mechanic+simulator+2018+unblockedPDF 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_off0000b074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB074 15516 bytes
SHA-256: a47d34f0dd2faf6a1399691f2e84c3d535308bbef3850b19e4957baa5a0bed95
font_01_sfnt_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 11500 bytes
SHA-256: 992175f4b66112615f9b41b64c27988261fd1471cd673fa105cd6e11c30322ee

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