Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de419f5bcf007b4…

MALICIOUS

PDF

94.7 KB Created: 2021-02-27 20:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ed73bfd472bd610c7b57c6f81ef78d9b SHA-1: 43b3e478cc9c0270fa72b92b9c0fcf8fe728233f SHA-256: 8de419f5bcf007b4bbc4579fc31cc88c09eb3c555f36a0eb08fc0c7bfccb63ac
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and link farms, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/aws?utm_term=insinkerator+evolution+spacesaver+xp+vs+compact PDF link annotation
    • https://cdn.sqhk.co/ligumorik/hdjTgeo/mikecrack_diamantito_4.pdfIn PDF document text
    • http://peuly.xyz/d_t_h_full_formzqata.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/DsKmuig/teachers_pay_teachers_worksheet_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480743/normal_601f0ceaaf2d2.pdfIn PDF document text
    • https://cdn.sqhk.co/desavusomo/igeihZn/57032012485.pdfIn PDF document text
    • http://euromarket.pro/how_much_is_a_srt_hellcat_chargerhyb87.pdfIn PDF document text
    • https://cdn.sqhk.co/xenaporo/3BRmnja/45997811990.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/toro_weed_trimmer_manual.pdfIn PDF document text
    • http://how2clever.com/bacteria_transformation_methodso4jxj.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/free_mixed_parts_of_speech_worksheets_with_answer_key.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/16980068251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5fe9f59eb2919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5fd6770c6aa77.pdfIn PDF document text
    • http://fishland.store/economic_nationalism_definition_world_historyzhs6l.pdfIn PDF document text
    • http://pomirkapa.site/are_they_making_a_breaking_dawn_part_3k9rg1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://makakanow.onlinewebshop.net/atwood_8535-iv-dclp_troubleshooting.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/9532011439.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 5088 bytes
SHA-256: 8be84f9a96c85b20e706e2de2ff7684f5130afb8b3160f373e5776c957725ba3
font_01_sfnt_off00013774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13774 11888 bytes
SHA-256: eb757475216f7b418c1197dbfd4e1b4b51707aeaafff67e820a6c7faf8e5731a
font_02_sfnt_off00015ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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