Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54241a781ede332…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 23:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eccba3d18a2835021d9c0d38a3c08673 SHA-1: 4d4360433e8f37cdc425fd9ec5e2a8b34e7d9b7e SHA-256: b54241a781ede3328652740b6f37897a5a27eca17eef2947f8a6058e9fd51610
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://megaprestige.ru/uploads/files/vekapujel.pdf In PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/fujijetibava.pdfIn PDF document text
    • http://szcftz.com/upload/34946029872.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/24470223743.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/birabase.pdfIn PDF document text
    • https://ijp2.com/contents/files/18619589066.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/48709148850.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/jefuwimamutuxifipovuf.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/laluguxex.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/ralidimawotimun.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/donikitowigitaxipubogivef.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/26717845245.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///linugatarexadoxajufewik.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/96019412572.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/92862855337.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/sawedirepalatomipasurup.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/8801534067.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/80336472045.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/20808765510.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/34715480544.pdfIn PDF document text
    • http://vkts.se/userfiles/file/taveja.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ae2c148349e696105f5ca3882c1111b1/72577038388.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/laxenokali.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/kabokelusagijesodinagoxax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=subject+for+sending+resume+to+hrPDF 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_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 18968 bytes
SHA-256: e4e915ed2b8132776df039cadb5dc4690313480d06a0161a68181eeb235f64df
font_01_sfnt_off00012255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 11160 bytes
SHA-256: e0cedf686f5271d5089ff7fd6dc3e39de935254b763c717e7fa35e78b649ac42