Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a7f8f460e7bc8e…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 11:01:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d47fdd4c4abfa32e9a551e00d5eaeb77 SHA-1: c56903faf90dd5ed0088f85e1b07de555df85ec5 SHA-256: a3a7f8f460e7bc8e08d88507b9ce720a8ddf80719c092d94497e2d78c45164ec
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=toro+model+20332+oil+change PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ffb4fd91cf59.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/hazqjfB/tengan_cuidado_letra.pdfIn PDF document text
    • http://gazzsheff.xyz/pibatoromotijojijumilixemuh485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465386/normal_5ff1cfbdcdd19.pdfIn PDF document text
    • http://prognoz-football.club/tipusovovuh7x5o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_5fd929ec08f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_601b54d6ece1d.pdfIn PDF document text
    • https://cdn.sqhk.co/gugexuje/ijztVij/i_love_word_to_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_601b8fcf35668.pdfIn PDF document text
    • http://kurs1.xyz/industrial_paper_shredding_machine_for_salecv8kc.pdfIn PDF document text
    • https://cdn.sqhk.co/lijipatalenu/f1xr6Sa/zamesose.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/hbjigcr/revolving_skyscraper_in_dubai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juzatapanosuwi.rf.gd/cara_membuat_google_form_tanpa_login.pdfIn PDF document text
    • http://mapureju.epizy.com/blackberry_link_software_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/i_m_a_mess_bebe.pdfIn PDF document text
    • http://baxajuzurajuj.rf.gd/operation_management_salary.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_off0000dabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABE 5560 bytes
SHA-256: 42a06b36d0d1013cb24311ae942403cea3ab9047472e14918da34b8d05e54fff
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 10944 bytes
SHA-256: 442a99c3e9eccb28069379d52febf712dcd21cca8a8f0650a83bfdf3ab10e9cc

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