Malicious PDF — malware analysis report

Static analysis result for SHA-256 f568ae9970f749b1…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 21:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c7b6408c8fe824b42291a2fe2545c3c SHA-1: 8135fc55681f260db76147a792612dbb295a1108 SHA-256: f568ae9970f749b140c34fd77be1942bb9e2ce5b2797ab785fb9799ffeda9cf8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior, indicating a high likelihood of malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=manga+reader+app+for+android PDF link annotation
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace3996262---93049482863.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/77190737011.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kibivow.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/19693418674.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/97901086002.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/roxabaxi.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/69819039505.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/60989020911.pdfIn PDF document text
    • http://briztravel.com/upload/files/kuretatamodabivofep.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/foset.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/werumanepimomakek.pdfIn PDF document text
    • http://khocabien.com/uploads/files/sekebi.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/tataxajesutujo.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/33724782857.pdfIn PDF document text
    • https://jensbrode.de/files/file/64001925002.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210905_160552_170.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8c35bfb7012b9b08c7ef9745b49a0f9c/77204939775.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/pavatateganofezej.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/mugozu.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613eea3c3bda0---20343999768.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/fediwuzegerib.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/zetago.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/boxolutudetomuso.pdfIn PDF document text
    • 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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 17588 bytes
SHA-256: 5614ff797b925862895961d4ba4d5db47129ca9cb56e092be50ecda545e6906d
font_01_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 10352 bytes
SHA-256: b62c63495c8ab480683abd73ed0ed08475d2cc8ec854930ca113892862bf19c1