Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea29d37f2fcd4d71…

MALICIOUS

PDF

76.1 KB Created: 2021-02-26 12:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8f686b80245d0c4927dbfb4345e7c0ef SHA-1: 2997549ce35809784954cc098bdc7c1c05603ea6 SHA-256: ea29d37f2fcd4d71e2bdd4592e2284b492b5001f4619d3df7dadd12ba420edff
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URL and the document body text, which appears to be garbled but contains a search query, indicate an attempt to direct users to malicious or spam content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=how+to+adjust+bluetooth+volume+on+android PDF link annotation
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/baruzidobavigudazed.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/determine_quadratic_function_from_table_of_values.pdfIn PDF document text
    • https://cdn.sqhk.co/muzedikerum/ejh3hbZ/27105011791.pdfIn PDF document text
    • https://fizemovumevomuf.weebly.com/uploads/1/3/4/4/134491325/pamefebujir-kunaf.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/jbYhj5p/79902829659.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/bigpWia/31053368614.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/hmoigC6/coin_counting_machines_near_me_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/igvif5G/brave_fighter_demon_revenge_pembalasan_setan_mod_apk.pdfIn PDF document text
    • http://penageli.getenjoyment.net/paul_johnson_a_history_of_the_american_people.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/spanish_inversion_words_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/gjjgMMH/jesusogobonidajugatuvezi.pdfIn PDF document text
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/dokokapajepoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamodaf.epizy.com/semicolon_worksheet_with_answers.pdfIn PDF document text
    • http://jujiruwer.rf.gd/36718809683.pdfIn PDF document text
    • http://jofesosozofoso.epizy.com/business_english_british_council.pdfIn PDF document text
    • http://nonakiwobituk.rf.gd/ski_report_scotland_glenshee.pdfIn PDF document text
    • http://sevogibigajo.epizy.com/vuwagi.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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 5392 bytes
SHA-256: e340a7330bb7dce1c37060cd54b1c8fc65e06fddc17c44103015e3ca7d2f8e06
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 10660 bytes
SHA-256: 96f263bfa8b46588ed376eaf5fbc4613984f92d0b699fd2a8ab6c3d7fa8c1207

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