Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51c4f043072e15d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-13 15:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a53afc4d4e2e769cc1137cf9e3160c69 SHA-1: b071675a5776d5d02cc278c6c468a6373860641d SHA-256: b51c4f043072e15d186eee70e824733d2dbb76c8164f07bb0fa2af696fd19644
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL being https://fokemale.ru/wix?keyword=hamilton+piano+book+pdf. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as Pdf.Phishing.Trojan. The document body, though heavily corrupted, contains text related to 'Hamilton piano book pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

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 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.
  • 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://fokemale.ru/wix?keyword=hamilton+piano+book+pdf PDF link annotation
    • http://lusowifivixava.iblogger.org/why_has_my_vax_steam_mop_stopped_steaming.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473638/normal_5ffe46175a691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391308/normal_5ff512327dac8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_0dc5517d7fc84a99bb1e2126d5fc0385.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/invisible_ink_mandy_moore_sheet_music.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_20771870dfd34fc5907e7a57cf107604.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jadere/zaxafafawolaxoz.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/conversion_of_units_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/how_to_install_ink_cartridges_in_hp_8620_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/what_are_5_reliable_sources_of_health_information.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_30bf9c16296c424ba1392b76875a512c.pdf?index=trueIn PDF document text
    • https://a7176590-a44a-43b4-8b25-1171fb6190ac.filesusr.com/ugd/e6ccb8_505e39f003fc45e98f1cd31a9991f5ff.pdf?index=trueIn PDF document text
    • http://luwegovufa.epizy.com/afc_fylde_away_ground_guide.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_6a21795ab227414988d626f899f3950a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/ocado_group_plc_annual_report_2019.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_5fa380ca467e4475a71c8f3ea23be78a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/mesegijo.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_872b337dd6024ff39a59872e4cc1f887.pdf?index=trueIn PDF document text
    • http://meralilenizo.epizy.com/metodologia_aprendizaje_basado_en_proyectos.pdfIn PDF document text
    • http://suvugetolativ.epizy.com/cascada_de_coagulacion_veterinaria.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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 5080 bytes
SHA-256: 51ff4efb5678750e7ae7854bb3700ed79d159f69c19653c8f597c26ead771d52
font_01_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 10476 bytes
SHA-256: 7ebbc0539d69acc1132c94fae8ba7fd0bdb1b2866cbfe44f26aa5c01c2c69204

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