Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d392c76cd502046…

MALICIOUS

PDF

85.7 KB Created: 2021-04-03 01:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 645a2560a756d40aa79928de927f3193 SHA-1: 75bfa8653f5d4330bd4a173243e7e46884c5beb3 SHA-256: 4d392c76cd50204649b09ffa1022d844649b02f2472773fcc23e5401ac291982
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 0.9996

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://botokaw.ru/strik?utm_term=how+to+fix+hp+6830+printhead PDF link annotation
    • http://creditreportfast.info/nevupobazaroplf5aj.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/what_is_the_name_of_tokyo_ghoul_season_5.pdfIn PDF document text
    • http://lusanubi.22web.org/marvel_rpg_character_generator_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529095/normal_5fccff5f0848b.pdfIn PDF document text
    • http://fizasibako.22web.org/midomuponupapo.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/parks_and_recreation_episode_1.pdfIn PDF document text
    • http://luwakixifotizim.iblogger.org/pufuvuripazefifinenum.pdfIn PDF document text
    • http://wrinklestiltskin.com/406902823678mk5m.pdfIn PDF document text
    • http://lutokororale.iblogger.org/awakened_james_murray.pdfIn PDF document text
    • http://graatorama.fun/river_flows_in_you_original_piano_sheet_music_freef8lxm.pdfIn PDF document text
    • http://cafechorsu.ru/mary_poppins_returns_songs_lyrics9ev66.pdfIn PDF document text
    • http://chambre.xyz/zajesipadapukotiparosakbjq7w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481825/normal_6013695244d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420476/normal_6003ae9f81f9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ladofinaziza.epizy.com/acta_constitutiva_mexico.pdfIn PDF document text
    • http://xikisefux.epizy.com/derejapigobav.pdfIn PDF document text
    • http://simolerifape.epizy.com/45671675745.pdfIn PDF document text
    • http://kipalinuki.rf.gd/fuzorasonew.pdfIn PDF document text
    • http://megoger.rf.gd/1124556801.pdfIn PDF document text
    • http://xarejaxeb.rf.gd/27599967429.pdfIn PDF document text
    • http://jopakete.rf.gd/roresabemuwejifed.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_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 5696 bytes
SHA-256: b6a3edb0d58211715c0f4898b995d433a515d9dc94630adedc6e17b1d54eb3f0
font_01_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 10416 bytes
SHA-256: 5516d0e50a5b53d458061f3fa091f824be21b688c38a559fe0ba67b947fe34a1