Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60264ec6722e1f1…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 21:01:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c93d0c7a91804888553bfb01b2391a43 SHA-1: 355a1d6141a07f2c21f39dc839652c6299dc116d SHA-256: b60264ec6722e1f17534f7efb0607855a69d8206ee0da3efce0134e32a64d295
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a search result for educational materials, directing users to malicious 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 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://ponafet.ru/wix?keyword=the+practice+of+statistics+ap+edition+pdf PDF link annotation
    • http://casbah2point0.com/48130227766iboza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5ff662a9b6b2a.pdfIn PDF document text
    • http://reawont.online/authorization_header_format_must_be_bearer_tokenv23w2.pdfIn PDF document text
    • http://ebay-coupon.ru/cyrillic_handwriting_practice_sheetsnp71e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_602f0ac613c95.pdfIn PDF document text
    • http://purpless.vip/apostila_de_atualidades_para_concurso_2019sd5ds.pdfIn PDF document text
    • http://immorta-cross1.club/download_hd_dope_wallpapers_for_pc2xs42.pdfIn PDF document text
    • http://belplitka.ru/the_4_types_of_writing_stylesjgwef.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/dafosetozekimipimajoxo8cm6i.pdfIn PDF document text
    • http://santecmb-sarl.com/diamond_guide_for_free_fire_apkdwlzq.pdfIn PDF document text
    • http://help-business-media.com/jusazitq6627.pdfIn PDF document text
    • http://springital.fun/aditya_varma_bgm_ringtonet5g58.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/spanning_tree_protocolaypei.pdfIn PDF document text
    • http://mybatut.store/zipavasitfquhi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_5fda73b970822.pdfIn PDF document text
    • http://parkji5x.xyz/dominos_employee_handbook044qc.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/vabedafozo/difficult_grammar_test_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/pumowopimolixonarugoj.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5160 bytes
SHA-256: 2762597757061eebaa53b165d308422c100e95143fad275eff8e73ed5c9c2498
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10476 bytes
SHA-256: 274c3451978314aa81c233343dc11d63c9058b62d09547d5be335601954cefb7

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