Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f09c7d8bf6e37d9…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 10:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3bed8aaf9510ab296431676e9e50e154 SHA-1: 804cfbb294c29d525534c34332e71b565535d0f7 SHA-256: 5f09c7d8bf6e37d9e354971721326df43949c5cc9e8c4114952b5bef1ee83ca5
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL suggesting a lure related to 'Blacklist season 1 episode guide'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content hosted on disposable domains.

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 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://kuzutuzo.ru/123?utm_term=blacklist+season+1+episode+guide PDF link annotation
    • http://nikecortez.net/sda_hymnal_apk_for_pc2h6tw.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/rorigosezipo.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/sowarusozufexes_zenas_xafosusezefax_gaxemuf.pdfIn PDF document text
    • http://milanomoda.site/5311485034358lo3.pdfIn PDF document text
    • http://idealica-it.website/checklist_template_in_word_2010wr9us.pdfIn PDF document text
    • http://huaweistoreukr.xyz/xerox_workcentre_7855i_user_manualhycpy.pdfIn PDF document text
    • https://sozagigojo.weebly.com/uploads/1/3/1/4/131454883/fce55e78d.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/nedijowewoded/call_center_metrics_industry_standards.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/havoc_brother_tamil_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74f5c24-5c18-49c4-8aab-3b493a9df059/how_to_troubleshoot_ac_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33671f67-2252-4c46-9ff6-e6095a27d106/fedufase.pdfIn PDF document text
    • http://falivodekolulo.epizy.com/warcraft_3_cheat_codes_hero_level_up.pdfIn PDF document text
    • http://luvurabanalo.rf.gd/grade_7_math_review_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17482a90-14bd-4c1e-ab8c-28c6efe75cd1/wigoxokigi.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_316cae7d099741098be89e719d2a7680.pdf?index=trueIn PDF document text
    • http://sisakuwoxamale.rf.gd/zejamulisulir.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/17792304330.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_da58dd0193e245f69d634d6b676acc62.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_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 5308 bytes
SHA-256: e962ad14a17dd8975211134e7b1be67c60a72cc468341e2858b354cea546f666
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 11224 bytes
SHA-256: 3f4ccede37a34f90faf376f4c0cfcaac6f52ff268a681225a36eb700d899d3b8

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