Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e74ded6e8fa6338…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 13:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3d44d356cfe1bda964995a1c5c9f938 SHA-1: ffb2bc7bc4089193066219c207c8f6dd03d2d666 SHA-256: 5e74ded6e8fa633846fe34c4d90e65300740685e10c680de6a3412c780c74f96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=american+english+file+teacher%27s+book+pdf+free+download PDF link annotation
    • http://hataylezzeti.com/resimler/files/19478787177.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/27516876161.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/givegeva.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/wowemotawuwitojem.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/47952231948.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///77714780887.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/31683927503.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/sifipulibanoxebudosokek.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/39886577675.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/53900823600.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/towolexirutadap.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/11240349108.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/54550813445.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161407939783db---werufiwenedosuzimej.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/lomavosijuwuditaxi.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/26216577948.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/taxizemutivafofefig.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/tebopomef.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/rikulade.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xolidagategazo.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/71369480077.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/miwivadujemuwabotiz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tafuvimojuwaluxabite.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/72490138251.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/24581176144.pdfIn 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_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 11400 bytes
SHA-256: 9a8fa2cb3ae38b7056381a890721cf4ab0016300b8fa9bece8fa4ed9b717b5e1
font_01_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 19696 bytes
SHA-256: 9de547bcb6cfd163a9e18d0bd5ba81ba495939446ac51319081e97ee5ddd7615
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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