Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3867b9c00732bb…

MALICIOUS

PDF

89.7 KB Created: 2021-02-28 23:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e2f0175832bc24adf9a047d0da255742 SHA-1: 71eeffe5a046c85ddd3b9a26ce93558614b343e8 SHA-256: ca3867b9c00732bb67bb0ed2abfad5aec3a8a077718cb44ea230c3067c09143f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging JavaScript for exploitation.

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://pelibifir.ru/award?keyword=how+long+to+learn+lockpicking PDF link annotation
    • http://prizinsta365.online/reading_comprehension_exercises_with_answers_a2z2e5w.pdfIn PDF document text
    • http://mestorating.ru/89796673489v8q4b.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/Izgiahh/epic_war_td_2_apk_obb.pdfIn PDF document text
    • https://kirimobo.weebly.com/uploads/1/3/1/0/131069812/tesetijesuxevifirifu.pdfIn PDF document text
    • http://ig-copyrightnotice.com/king_arthur_s_magic_sword_riassuntotgoty.pdfIn PDF document text
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/35b225.pdfIn PDF document text
    • http://persequenteamsohbet.com/fubilazv2a0v.pdfIn PDF document text
    • http://parralax.net/bizexatugogudvgg4.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/nabuk-pipora.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://takarifidatumo.epizy.com/sony_rx100_iv_video_specs.pdfIn PDF document text
    • http://bajepazefifu.rf.gd/sojimedafafesigafosudaram.pdfIn PDF document text
    • http://wagibederujejo.rf.gd/descent_into_avernus_google_drive.pdfIn PDF document text
    • http://linawewadonan.rf.gd/38808795891.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 7584 bytes
SHA-256: 929f5f6b8680af4ef90d152bb62bf01fb1f4b618251c73072012a24de7774fb8
font_01_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 5040 bytes
SHA-256: fdf49ea129ac2a19885ef9b4cda1f851f94bced14846deecb0764f3487d00d20
font_02_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 10892 bytes
SHA-256: f7f61b9efc133af490e63b0c42a08b8814ece5bb422197862e81241959592fed

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