Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86084596bec301d…

MALICIOUS

PDF

88.6 KB Created: 2021-03-31 13:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 26eac4cc1d65124ab701838148aac51f SHA-1: e3bef75aff5339e6183d2a1da4c68529657f38ce SHA-256: c86084596bec301db0938ec07920c2d2593c93c70f88990e1e47ec75b779e92d
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=john+dies+at+the+end+book+review PDF link annotation
    • https://cdn.sqhk.co/wodabumamuv/ij3igib/hungry_shark_evolution_mod_menu_7._4._0.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/ji4ij2U/94638938709.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/jdZQ2gi/64861005001.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/avent_microwave_steriliser_nz_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/ijijibR/minesweeper_download_pc.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/bafazer.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/6597339362zwt31.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/cOgjhb0/como_descargar_the_battle_cats_para_pc_hackeado.pdfIn PDF document text
    • http://klokisik.space/pebezebitomezj4ilz.pdfIn PDF document text
    • http://blockingscenery.com/49872599667l1mjt.pdfIn PDF document text
    • http://7lessons.fun/nuevo_testamento_interlineal_griegoik9jf.pdfIn PDF document text
    • http://litvinenko.xyz/169858393oj55z.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/hfssjb6/56685474066.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/aiasjex/videos_engracados_para_whatsapp_curtos_2017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_2c8ec47e23834fa4b4079c9950581b4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/21536238290.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_52afaa1f7cd847fd9a80649a6c36fa1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/bangladeshi_gaana_song.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_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 5224 bytes
SHA-256: e6bed16a964b53399b2d2bab0e0797125fdbba3310601e9eb34dab45475886d4
font_01_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 10740 bytes
SHA-256: 5d133bcddfd365a4c89cc2871896b947b6562260421fe21d5c5017265c790716

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