Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5737fd06611c29e…

MALICIOUS

PDF

71.9 KB Created: 2021-03-16 22:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: adeeca8c44b8396c53e0527921ec550b SHA-1: 049198364791b0afce73e023483ee2c1afa6d257 SHA-256: c5737fd06611c29e2c1f47ecb093af2d08056f90e4883396c362643c37ce9460
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/award?keyword=sustainable+building+design+manual+teri+pdf PDF link annotation
    • http://lagejarejitog.mypressonline.com/23378710008.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifesu/xurafis.pdfIn PDF document text
    • http://xojakejib.epizy.com/weather_report_for_clarksville_tn.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/wetelu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/jaxorixu.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_582a493ba02f4b5981dc29878eedad17.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vunizi/vusifonabubewekinadag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/494aa320-bcad-4390-8832-64b46be8d722/critical_social_research_definition.pdfIn PDF document text
    • http://gitojaxekeveki.onlinewebshop.net/wadosekafu.pdfIn PDF document text
    • http://bomapogixojepo.epizy.com/vaxedomuzopoxoxalose.pdfIn PDF document text
    • http://zimemotom.rf.gd/cell_diversity_compare_and_contrast_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/65435026766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5c7e68-4ee2-461e-8e51-b09148fcdefa/shimano_di2_app_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f381d4a-6655-4f81-9ce9-d8496b285e60/39741763233.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/83784036286.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/diaper_genie_elite_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/birutixojenux.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_ca37b898f3b64aafa0a9383938a1c7e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/viviparous_animals_information.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5604 bytes
SHA-256: dd48734e4d02119cec8585e7a9d979243ae7ab5f666b9238b040b72f6376798c
font_01_sfnt_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 10772 bytes
SHA-256: b686d1b28707b896f241066b8e4b5c3dcca41a1bf4990f15355f47996dfdd1f0

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