Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdfb3a88d0e42a7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 20:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9467876e168a7448f964cc5e9f8adaea SHA-1: 54e6863cbbd0d2a2727b5f9e5a6a12c560ed28bd SHA-256: 0cdfb3a88d0e42a71e5b94f643bd45ce11604711f14d18a6e3ecc3a084d6693b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=8+ball+pool+indirect+guideline+mod+apk PDF link annotation
    • https://www.disbel.es/ckfinder/userfiles/files/kimakerovusesogib.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b4ab1856---badanevidapuzusitok.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/mufipasamisimaneso.pdfIn PDF document text
    • http://101balkon.ru/upload/files/lulaniwofebevozuko.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/36469467358.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/5169661667.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/65475539029.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/75809549903.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/xenetido.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/76957771096.pdfIn PDF document text
    • http://speckrepej.com/upload/file/83176283109.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf01a1959c---xedatolemunibezizokosir.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/24589828679.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/lirugokototaw.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/nefewo.pdfIn PDF document text
    • http://floramarble.com/uploads/82473868790.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/42066677856.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32284445789.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/retaliwisiki.pdfIn PDF document text
    • http://remobudostol.pl/pliki/28862712779.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/2846391307.pdfIn PDF document text
    • http://intertribo.sk/files/tuwowuzij.pdfIn PDF document text
    • https://umutfm.com/resimler/files/52091569950.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/6359510294.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/xujudubaxatalijogit.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210908183624.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_off0000c733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 11132 bytes
SHA-256: f5549b896fabafd086f4c1659a3120d1c693b8e148d0ca29771dd81fe2d5feeb
font_02_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 19028 bytes
SHA-256: fd60687a303020d30f88ae0a452756329fb4b2ef7ecca39f6b889f99482a5177