Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b767d79723788…

MALICIOUS

PDF

85.3 KB Created: 2021-05-10 12:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1dbaaec32c585e551453e9846eeb295f SHA-1: c3f166882394de0c1c3fb11d6b6a3cfaae93055a SHA-256: 115b767d7972378858a52d001f165e7aebff5006f96f9aad68d9101f519c85c2
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 0.9997

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://soxebez.ru/strik?utm_term=human+computer+interaction+masters+germany PDF link annotation
    • http://bigakeka.iblogger.org/kipaxojujiwewojexu.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/biiP9gg/lolusivo.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/i5IS30k/51937093263.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/AjdKmYo/used_motorcycle_clothing_shops_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/idqD1NG/24172033395.pdfIn PDF document text
    • http://poradoit2.site/598503133467c5r5.pdfIn PDF document text
    • https://cdn.sqhk.co/juzureniwibu/gjUDibt/26330325364.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/ejdgegh/perakeloz.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/apdiiih/aerial_duels_meaning_in_football.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/hbMvHVM/82508416142.pdfIn PDF document text
    • http://damvglaz0.xyz/8357661755xbjys.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/gDYxjaA/free_sunday_school_songs_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/heKThgy/77626635199.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/hdibkia/blood_money_love_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/niaqkij/83419087780.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/8bgdgjV/64345365217.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/wefidod.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/gcibxQV/linkin_park_2020_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dofumuligo.rf.gd/bancroft_season_2.pdfIn PDF document text
    • http://dawutanarav.epizy.com/75183156904.pdfIn PDF document text
    • http://vemevusakeke.epizy.com/rixovaputireb.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/51220668814.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_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 5284 bytes
SHA-256: eb5cea1f8c12afc7d4f3bb3feacd1ef2d4e19692ee4ba86fb8d0dbc36e56c333
font_01_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 11992 bytes
SHA-256: af3f037a7e251a0957b6aac52f8e9b33f3f7cd7209645773ad96ece5a8d8bcb8

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