Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73490fc6680597d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 00:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cb1f8c57cd2cbcf0514909b1393ec8d SHA-1: 16b294f908ede0f52e8e76c7c3d9980251fe2676 SHA-256: a73490fc6680597d42fbe92a087c036b2af7f341646fb8dfea5a79707e08807f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to malicious sites. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/26490859967.pdf
    • http://topbuild.net/content/xuploadimages/file/48499388711.pdf
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/sosozuverotageraj.pdf
    • http://trip-sale.ru/userfiles/file/sutiberak.pdf
    • http://metaglas.kr/userData/board/file/80660902518.pdf
    • http://porpora.group/imagenes/imagenes_contenidos///sipeturivixepov.pdf
    • https://lenaoyunlar.com/calisma2/files/uploads/99233838247.pdf
    • http://ocean-ex.com/images/blog/file/51371318007.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f15d61e11b---40478408464.pdf
    • https://quasar.mago.ro/ckfinder/userfiles/files/wikuzozuvolubifumumaxe.pdf
    • https://skinrepublic.vn/webroot/img/files/68965746066.pdf
    • http://thekitchendesignstudio.org/uploads/files/76019396716.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/vuvomage.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/pivomolafik.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/60371836121.pdf
    • https://almuhja.com/ckfinder/userfiles/files/21462334354.pdf
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/roludalinatasu.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/zomukotorafurokuwedu.pdf
    • https://srsatta.com/ckfinder/userfiles/files/91198193847.pdf
    • https://fivetc.net/uploads/files/gutafusim.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/88377921365.pdf
    • https://edubox.mn/uploads/users/0/files/99987731846.pdf
    • http://transgusto.ch/userfiles/file/safuvowusanimojokov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+tweaked+apps
    • 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_off0000df60.bin
49265216b917aad91bdb2db4c7046808295a2a1e30e3d2634bd25f6f8c1ba0dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 17084 bytes
font_01_sfnt_off00010b30.bin
4beb3d253ce16fa7520c57426a1badfe325ba0ff5738c4f6d3198debc3287171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 10496 bytes
font_02_sfnt_off00012343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 16792 bytes

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