Malicious PDF — malware analysis report

Static analysis result for SHA-256 34de4f253c7c1d15…

MALICIOUS

PDF

84.9 KB Created: 2021-03-24 06:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 77db7ed2382f22f4cb89079d34eca3fc SHA-1: 8186bbcfbfaa694e2852b5ea21b2883306bf0917 SHA-256: 34de4f253c7c1d15db49d2810cc42822fca660ea355c59d325c9c109cbd00e87
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=heat+n+glo+gas+fireplace+pilot+light+troubleshooting In PDF document text
    • http://medgaj.com/36770751605uab1t.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/gifitubupisaxux.pdfIn PDF document text
    • http://the-job.ru/fundamentals_of_fluid_mechanics_7th_solution_manualmmbvc.pdfIn PDF document text
    • http://zifujujefilat.iblogger.org/65273764947.pdfIn PDF document text
    • http://odemebayisitrafik.com/toyota_repair_manual_for_chassis6pz1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450636/normal_5ff50eab5109c.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/jaxemonovupuve.pdfIn PDF document text
    • https://neveloso.weebly.com/uploads/1/3/1/4/131408616/1aaf108c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_600fca6887b98.pdfIn PDF document text
    • http://temipedozut.22web.org/calisthenic_routine.pdfIn PDF document text
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/7683d8e347807f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_6044d66c40abb.pdfIn PDF document text
    • http://liolika-rsya.ru/fataputusomiretomosolavign5mp6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_60344766b185a.pdfIn PDF document text
    • http://vulifux.66ghz.com/conic_sections_test_review_answers.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/a077ff95c.pdfIn PDF document text
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/dijeniniduta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuforikoxiv.epizy.com/divergent_book_chapter_25.pdfIn PDF document text
    • http://kugofabafomozo.epizy.com/virazile.pdfIn PDF document text
    • http://tunawuzitaxavu.rf.gd/present_perfect_with_already_just_and_yet.pdfIn PDF document text
    • http://wubogijogazerew.epizy.com/6._definition_of_derivative_homework_answers.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_551f376c79b549aaa3d64fc973845267.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_5948dcb7756f4ea0887dfb5ef19efda3.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5380 bytes
SHA-256: ec05b05e312f312f46803cee53f38337fc232c1582233c1bc8cd0e413e44d05c
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 11304 bytes
SHA-256: eceb961c1b38df5f937071b8eca86a59db579d8bf182a02f8d8a5c7e50827a06
font_02_sfnt_off0001302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501