Malicious PDF — malware analysis report

Static analysis result for SHA-256 10796ea265d35e97…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 22:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edb6432188c77179e12e28dc772ed8e7 SHA-1: 44acb262ae0f610449fedb308c74124e08a02990 SHA-256: 10796ea265d35e97d7a9134317078db2baa6c5555b4db1c88be0a46939cbc654
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=gta+v+free+download+without+human+verification
    • http://x-site.by/upload/editor/files/dogumufagazeruto.pdf
    • http://baihsad.com/userfiles/files/20210918_190049.pdf
    • http://ruresept.ru/files/file/63529042309.pdf
    • https://cargobull.cz/res/file/45135579155.pdf
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/42375543787.pdf
    • http://wx-test.com/upload/ckimg/files/202109190514531625.pdf
    • https://erdenet.mn/userfiles/file/nubafetabigubinala.pdf
    • http://gesgo.de/userfiles/file/kuvisibavef.pdf
    • http://manpukuorder.com/uploads/files/nirelasekoxisuf.pdf
    • https://scalping.ir/data/files/file/80809284774.pdf
    • http://hindel-relax.ch/ckfinder/userfiles/files/wijumegix.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/bixanojomi.pdf
    • http://phamtrangia.com/upload/files/kaziravu.pdf
    • http://paramountswimwear.com/userfiles/files/tumagajemazovuxuj.pdf
    • http://rowadhr.com/app/webroot/upload/files/90903698326.pdf
    • https://hse.tw/upload/file/40096653460.pdf
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/pabavamajejegin.pdf
    • https://satesayap.com/contents/files/38951369098.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4a136143e6618f2361d21a9f2e67d28e/mevewarixulu.pdf
    • http://kiszelyugyvediiroda.hu/docs/file/gazenesabisozuvegube.pdf
    • http://progettogeometra.it/userfiles/files/71004462999.pdf
    • http://canvangdientu.com/images/file/35649472767.pdf
    • 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_off0000b10d.bin
4aa961a9812cc7a7e3cd7f03eef18f5338d61a844580cd70041d226ca19226ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB10D 18552 bytes
font_01_sfnt_off0000e132.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 16792 bytes
font_02_sfnt_off0000f949.bin
84272096f539de56652ff1d7c966201beaa8cddc9dd23aba075ac291b1a851fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10864 bytes

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