Malicious PDF — malware analysis report

Static analysis result for SHA-256 21856e23db46a3fc…

MALICIOUS

PDF

82.8 KB Created: 2021-03-12 15:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4d40730d6ca18bcd8d5836684c974ac4 SHA-1: ce48ba5e069a2359fcc97f8bc61c7d30bbebe536 SHA-256: 21856e23db46a3fcecdf2d7941a307ad97f1b119ea136b595573a6a9875f7d08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/strik?utm_term=anglo+saxon+riddles+worksheet PDF link annotation
    • http://hydrofthol.space/janavowuvun4g2q3.pdfIn PDF document text
    • http://keepqifi.site/is_liftmaster_better_than_chamberlainlzscv.pdfIn PDF document text
    • http://ruzoboxilotazex.22web.org/berthold_akzidenz_grotesk_family_free.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/curso_primeros_auxilios_psicolgicos_uab.pdfIn PDF document text
    • http://ccckkkkk.space/98468285816tjoj5.pdfIn PDF document text
    • http://okrasote.info/how_do_particles_in_a_solid_move_when_heated4nap4.pdfIn PDF document text
    • http://watertea.space/star_wars_edge_of_empire_character_creatorc5iyd.pdfIn PDF document text
    • http://andyhongdigital.com/miller_thunderbolt_ac_dc_welderupiz8.pdfIn PDF document text
    • http://8bitbeardsco.com/kezipusikobi7xo.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/putaxu.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/11025507874.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dawovizi.epizy.com/jutalulaleferegowirili.pdfIn PDF document text
    • http://pisironebininuw.rf.gd/placement_test_with_answers.pdfIn PDF document text
    • http://wanudozadix.rf.gd/84080177731.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_ce76bbfc4d434abfbb2d82629ee016ae.pdf?index=trueIn PDF document text
    • http://bubezowi.epizy.com/life_cycle_of_a_chicken_worksheet.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_671c0dea75ef4a09a063775ff815aabe.pdf?index=trueIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/25418669123.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/79852933390.pdfIn PDF document text
    • http://viwivebobip.epizy.com/wazebujazoxezaka.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_9e1bd2f81dac435384640afa53cd387a.pdf?index=trueIn PDF document text
    • https://d64d5b41-a66a-4b78-b87f-0feaf8e9cf76.filesusr.com/ugd/cf1aed_313e2d719dbc4d5c9d0aaaaf336b1a95.pdf?index=trueIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_9bd65b71e83e4856baa02e0890e06e0e.pdf?index=trueIn 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_off00010693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 5300 bytes
SHA-256: 301aed260185c66532a77a01f0e43200dc270da74635d31c6ac6a33f2ff59369
font_01_sfnt_off000118ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AD 11108 bytes
SHA-256: 18ecd2d42e3adafee8af748211aa8063466d5ae90aee882ec9e394bd6dbd3bac

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