Malicious PDF — malware analysis report

Static analysis result for SHA-256 154856c04acf6eb8…

MALICIOUS

PDF

68.1 KB Created: 2021-09-28 08:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18f6d357fab2d430350b34e1d5c521a3 SHA-1: e488a398287a8c61379a99f58dc3e994399beafe SHA-256: 154856c04acf6eb83188fdc88ae055a9271216dd678094f6b621ad49d0ef5b44
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous external links, with one prominent URL pointing to a potential redirector. The document's structure, being image-heavy with minimal text and small file size, strongly suggests it's designed to trick users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://queure.ru/uplcv?utm_term=how+to+watch+free+movies+on+the+firestick
    • https://projetounificado.com/uploads/files/77073385047.pdf
    • https://jkmart.net/FCKFiles/File/32066543870.pdf
    • http://autolubitel-irk.ru/userfiles/file/pojunad.pdf
    • http://yule-sign.com/upload/editor/file/20210916060620.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e1c5f4717f6961cbf9f610dcccc44c25/gakovesagumaderopi.pdf
    • http://hidropro.hu/upload/noputivixepadogokipoguxil.pdf
    • https://angelsstaff.com/uploads/file/kexeserupa.pdf
    • https://mccartha-cobb.com/userfiles/files/29123501141.pdf
    • http://www.celso.org/download/39346356291.pdf
    • http://oresteruggiero.com/userfiles/files/denenolidizapofisuba.pdf
    • http://handbook.hu/upload/page/file/debirerituweru.pdf
    • http://kzlo.pl/fotki/fotki/file/4783565392.pdf
    • https://upaspor.com/resimler/files/zuzifatamuzigusupuparub.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zarafajurufunapedudon.pdf
    • https://emenu.hu/editor_up/49489697005.pdf
    • http://youngshiny.com/userfiles/file/1632587423.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca0ee8629---49009524208.pdf
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/94513033217.pdf
    • http://www.cottagegrad.ru/files/file/fikuvawikod.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/wuvaxem.pdf
    • http://khangvietdn.com/uploads/file/88705629943.pdf
    • https://hsse.cl/files/12066077189.pdf
    • http://jonme.net/ckupload/files/gegitolerubi.pdf
    • https://bandotrading.it/uploads/file/vupesumutotigi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee5.bin
04779a7812e3ad6c59379f477ceacc2a8ed05c5d7ef0e2722a4ff280681469a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 10792 bytes
font_01_sfnt_off0000c7a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 16792 bytes
font_02_sfnt_off0000dfb9.bin
a0774072ebf7eb6d732e328d0b0f8df2dd37ee78d2e2e5df52da6b45ada324d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 14160 bytes

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