Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0306c4261ae2d68…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 01:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ab5e0a950ef4f371e337cb2b70dc0fd SHA-1: 2782859498a84d889afc19d669f8f6600db7f8d8 SHA-256: d0306c4261ae2d6815d7534da1f030bb9336eded8056002735b95b5e28575ff5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=despicable+me+3+english+subtitles PDF link annotation
    • https://planningpvedh.nl/ckfinder/userfiles/files/kutufomofigixipupesiwi.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/lemologebi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144243e84f91---fawowabasulatinelele.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/34869220537.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/71468158985.pdfIn PDF document text
    • http://ifap.it/images/file/dilizadilu.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/54319078302.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tikoxofogosiziruna.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zumudupotod.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/53968405833.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nodapasagatewanuxaramiga.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/63620321694.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/mowutexaweropirafi.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/wowepav.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/bobevomeraropabiriz.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/84457891097.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/16397434533.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/81726468514.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/95148938518.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vozen.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/9339294264.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901170131.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/56073202448.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/2862440907.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/62268358928.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_off0000c8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C0 18488 bytes
SHA-256: de9b640f13f12c52bc17e26e87fec16467bcf83b48da486c8ec24d0c833312cd
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 11016 bytes
SHA-256: c1fd7b91d5c2bdccdcc3acd53f7db2cdbd56ef02e8dc1f6fb92bc41b5b28a395
font_02_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1