Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe333b141d316e6…

MALICIOUS

PDF

96.0 KB Created: 2021-10-05 00:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 43f4b4b85a6100df4479c4186a53711f SHA-1: daae1b186b61471fd4ad407b2d4a0b8cebaa4851 SHA-256: 8fe333b141d316e687d8750a750e11a5365f288da5a2844d80e588487b9a7828
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high concentration of links on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.akilciilacdernegi.com/ckfinder/userfiles/files/gonoliwixoxosikedezo.pdf In PDF document text
    • http://dglytbt.com/upfolder/e/files/20210917144621.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/wikonijonixul.pdfIn PDF document text
    • http://saktigroup.in/uploads/47659447757.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wosuxirexusuruzun.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/95546786661.pdfIn PDF document text
    • http://vladekoservis.ru/files/gajarowojepubujiju.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/fipidajofobugujivubuvamu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/gewolatawatatodog.pdfIn PDF document text
    • http://1careglobal.com/upload/files/44748455967.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/noporobagi.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/vokebaturugusewit.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/12460306461.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bawafeki.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425fc11fb06---dotaresag.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/47e228bb0ceade950f51fb5333410ea7/92097693817.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210912035528940.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/pezitamiguzisalivuvozob.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/dobogu.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/96586701432.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/mojofufowekuwefawiv.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/96481412944.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/67255965610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sister+brother+relation+quotes+malayalamPDF 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_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 19764 bytes
SHA-256: 16bf59de80e241d7b7fe7a88653b5119fc7289798f808621ede75196276855fb
font_02_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 10948 bytes
SHA-256: ab6a3eeb6e898c27e3c9cd443a1c0b3c082c83caa6dde07adaf56b75aa8269b1

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