Malicious PDF — malware analysis report

Static analysis result for SHA-256 81df2279b9b9f07c…

MALICIOUS

PDF

174.4 KB Created: 2021-03-22 10:04:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e800c8ce53e50a4ac05f7328f9276af3 SHA-1: 2f252054f31f2d74dd64c49a50dd79fef25f14f9 SHA-256: 81df2279b9b9f07c36f6d8cb3a4c8bd9e70115b6b38cf7f149bce2ecbf733380
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or suspicious-looking domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on potentially untrusted hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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://kuzutuzo.ru/award?keyword=past+simple+exercise+pdf+elementary PDF link annotation
    • https://cdn.sqhk.co/wekababu/oIhjkij/royal_fish_and_chicken_columbus_ohio.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/hjegshc/xotunap.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/4jhhg9y/mushaboom_bright_eyes.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/king_lear_themes_powerpointhb01m.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/6jcZgif/rank_and_file_definition_government.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/nieUAj4/puzidirokebemom.pdfIn PDF document text
    • http://barbanapoli.moscow/air_hog_millennium_falcon_quadg5m4w.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/wipotegadodorek/we_are_all_completely_beside_ourselves_karen_joy_fowler.pdfIn PDF document text
    • http://kafagida.rf.gd/warhammer_fantasy_dd_3.5.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/bonolibasu.pdfIn PDF document text
    • http://bamoxopigodarok.epizy.com/proof_by_induction_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/davozusazatebo.pdfIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_8e30481eb9e24d5baa4f9d65f0fb1266.pdf?index=trueIn PDF document text
    • http://xejipej.rf.gd/luvufafipewemasenozu.pdfIn PDF document text
    • http://tilitun.epizy.com/42985482853.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_d67e4b632cb74a8eb45c8ed167015256.pdf?index=trueIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_9fd59d2c33f8494b92c788f3205821b0.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_4b4e136391ed4c3badc17be567ba1351.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_off0002731e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2731E 5472 bytes
SHA-256: 06f7d09f6d602b2b22cd4fc5fff6f8d8a39672c6aa0dca471168578c81676df9
font_01_sfnt_off000285b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x285B2 11508 bytes
SHA-256: b8fa4f378a9e2e87c641269d783e0d5fa34f0ba48a5184ac5bc1d184890ff806

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