Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6d34adab6d0bcc…

MALICIOUS

PDF

90.4 KB Created: 2021-10-07 17:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4a0cde3ef117dbd344d395a35851261 SHA-1: 2a2176e6441eee3fee4e28ce31d2e19f197d9935 SHA-256: 8b6d34adab6d0bcc33909bc8928b35e0d25433e8dc1130f3dba092123ec3062b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on disposable hosting. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially malicious content. The PDF structure and embedded URIs indicate a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=i+have+a+abscess PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bc2406113a---wubanusewedanirafutudurig.pdfIn PDF document text
    • http://tulga.ru/editor/files/mubunekanakarus.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/98944315657.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88725582741.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/61738209041.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/nixenonezami.pdfIn PDF document text
    • https://people11people.gr/uploads/File/83100378022.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/54190686632.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b170c2f6b6---28654140766.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/xanak.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/wizonofisitubepid.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/24677087254.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/kenasunik.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/42068717815.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/rodoba.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/42967893288.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/82240589047.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/pogisazudo.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/fitaro.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/nawisaluwusaxovirugo.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/rokojig.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_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 19140 bytes
SHA-256: c71121c0ebc7bd89550366c81dc8d0e041e0afc6f04d38398a9ab67b924bedcf
font_01_sfnt_off00012e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14621 9924 bytes
SHA-256: b271f1724bce8a67e53902b4f8fffe9f72887f4abda55f4a16e8fbd99a6e1dba

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