Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba266abdea7b38d6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-10 02:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a621189129616cd33f0bb3d27d9985e6 SHA-1: 92dfb49b7ae9a222723e9692921cb012e4ed984f SHA-256: ba266abdea7b38d6b0a45350782a81933356f8aa9c8c3908887e9fddc17a58e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure malicious destinations. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=pes+2020+apk+mod PDF link annotation
    • http://tunecharts.com/userfiles/file/44561238934.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902073241.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/94823005030.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/wozepanijej.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/goxijoliliva.pdfIn PDF document text
    • https://hsse.cl/files/76825293190.pdfIn PDF document text
    • http://turatabor.hu/media/muriwigaboxumovulozajarel.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16310435021897129383.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/81377718908.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/zakadizesunozelase.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/tuvavekigegajobulup.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/24046117650.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/15777981911.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/19978165081.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/pg690ut0b93hm4usp1r84e57m5/liguwirexovoribe.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/42226701275.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/32617676354.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/bulaxiwodevegudu.pdfIn PDF document text
    • http://micruts.org/userfiles/file/bafixifibebitexowodago.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353c6118189---88269254975.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/guwopogukuvojofedozak.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/7692415680.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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 18200 bytes
SHA-256: 1262a2334bcab61be09c11618c6a0fff241c9508cee1dbfef3f409d2a51de73d
font_01_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 10448 bytes
SHA-256: 1e3692e3c606bade0b8cef342d2ca07cd0b86b567af896b6531c94a15a30d432

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