Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7866a2230698c8b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 17:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 156d5f7c4a5c480c9b3a13e581f74453 SHA-1: f07947098bd6bd4c7793b7bca9f8d3689e693f63 SHA-256: e7866a2230698c8b6937de4f90b5f38946b86a9db541e0445bb1d3c810b26193
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs point to various PDF files hosted on these domains, likely serving as lures or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/929768e7e8dcb8ecc14ca73f3dbb3dbb/tudisalilalujerox.pdf In PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/jomuwopovuxadi.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210908_F84C921810A54913.pdfIn PDF document text
    • http://www.pilartangguh.com/file/75231207673.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/mowiraneliwikigisewavir.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/jetuzefutewu.pdfIn PDF document text
    • http://dsraxys.com/uploads/29844462834.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/17037759869.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/96015430806.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/mujibanojupov.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/45995527172.pdfIn PDF document text
    • http://mamitobe.ru/files/file/gimuroziri.pdfIn PDF document text
    • http://sinoorchids.com/image/file/gezas.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/16052995540.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/xononadabaxikupamitemov.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/6888197053.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/loxox.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/kepifivu.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/39845468913.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/43653588973.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/mukuje.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d6cb57c5---beruwupujumotovibudu.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/torit.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/rusuvimuxududof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=extract+text+from+pdf+using+vbaPDF 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_off0000b8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 11308 bytes
SHA-256: 7e0215d3fef6b7b0beb9110dfbcb242d7f09c77eab9677a74c1c8113f6c38dbf
font_02_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 15680 bytes
SHA-256: 4861326a9e803feb6c3e3c7936c9b7712fa93815db0a0c61437fcfec4e8d892e

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