Malicious PDF — malware analysis report

Static analysis result for SHA-256 f291bcae91095c2b…

MALICIOUS

PDF

67.7 KB Created: 2021-02-02 00:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cb7e4c3ef91bd1137d1d664682928f29 SHA-1: 5061722e599a28c20992ea8e3fe63bd0a2f77ec9 SHA-256: f291bcae91095c2bd26183ed28823e14ec06fc96580ce014c2db230d11c07c40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=national+speech+and+debate+association+jobs PDF link annotation
    • https://cdn.sqhk.co/dubutemaruxu/pohfq3U/tie_dye_background_pink.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/azgdz8g/download_mod_game_magic_school_story.pdfIn PDF document text
    • http://ipoteka.net/sikexisesikinebujado6u5uf.pdfIn PDF document text
    • https://cdn.sqhk.co/bogabixexuja/ghYibYM/20283734981.pdfIn PDF document text
    • http://bitsracing.net/56700650101kvlus.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/Ehihbjh/gozixegutusuvugikogi.pdfIn PDF document text
    • http://delaem-sami.online/codigos_canales_privados_rokup03u4.pdfIn PDF document text
    • http://winoraama.space/varmints_bookakart.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/Thgbtjd/leap_disney_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/43AX0Xq/98625790930.pdfIn PDF document text
    • http://theandyhong.com/acls_hypothermia_protocoloaiiw.pdfIn PDF document text
    • http://kefets.xyz/95526668821i6n2k.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ipXjaji/83654194131.pdfIn PDF document text
    • http://ruzunolesar.iblogger.org/checked_formal_pants_for_mens.pdfIn PDF document text
    • http://kanshoper.site/xewojipaburewurir5dq8p.pdfIn PDF document text
    • https://cdn.sqhk.co/paparidew/kgdjiqJ/ncaa_basketball_championship_trophy_replica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegozijagomon.rf.gd/weremukutuviwa.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCB 5248 bytes
SHA-256: 7769a5f8d2b709df5ece3c90f865a11fc64c554e88954c4bad05f5f0436b9ec9
font_01_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 10296 bytes
SHA-256: de9971badd9e1766402999cfece0fa9387f740fcdf452db2a0c723fe2f609e8c

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