Malicious PDF — malware analysis report

Static analysis result for SHA-256 546ed0f160a86875…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 00:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4fa137e58fe556aadcb531769cb27f4 SHA-1: 335147e60dee7a463ca9272905218c12f8fcbd6b SHA-256: 546ed0f160a8687577b3839b22baa35078fe9bef6ab0cc951f80ddf9d650dd9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest it may leverage embedded JavaScript or other mechanisms to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=flight+simulator+2020+android PDF link annotation
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/sepofamadupejomo.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/mabiz.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/20471343039.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/bavifikowobixukorokabap.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mowugigezebivejaparodeka.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210916_050840.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/nopagijoxixoxomu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b223b1eb64c8c692e15101d262cdcfe/40652452080.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/78002543428.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/mekoviwof.pdfIn PDF document text
    • http://01host.ru/userfiles/files/4410511775.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/18284849711.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/diruruzitebipuxulisod.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/tuwalonekoxevigifozef.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/33102810413.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/79609862423.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/zupowazamaforavowenozex.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/gigopax.pdfIn PDF document text
    • https://ratoempat.com/contents/files/12687957437.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/patasufimakidixulix.pdfIn PDF document text
    • https://zzwgjx.com/d/files/13361484966.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/97151252504.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/falawisukisetivunu.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/33464577639.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/82459827790.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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 10884 bytes
SHA-256: 14cb10b8eb0040cb335ce65031bdcfff6cfa3881921d5504cf59431667430c21
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 18020 bytes
SHA-256: 485b02c51c049dd96b52867224186609c059e92b23ae19191a8d3875a3f21add