Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bf7e92b2cfc711…

MALICIOUS

PDF

73.6 KB Created: 2021-05-11 01:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 179f9751377e2a6c64a2ef566de00962 SHA-1: 521fa52164000c8f4821962ae50fce06d71da2ac SHA-256: d9bf7e92b2cfc711ed1e353e54baf786cd5872c00e150a985d08002a322fa4bb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly suggests malicious intent. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on various external domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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/strik?utm_term=star+trek+ships+of+the+line+posters PDF link annotation
    • http://vwwv-avito.online/how_to_say_bright_orange_in_mandarin0ybc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60345fb7c1a65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_60379cd61ac7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5ffa1dc1e95e5.pdfIn PDF document text
    • http://tokepefanoxite.22web.org/norman_stone_breve_historia_de_la_primera_guerra_mundial.pdfIn PDF document text
    • http://busibear.com/drift_cup_racing_crazy_games4ycg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425915/normal_5ff6d135f07f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_5fd09ea68d3f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_533be56da5e349b297d15eb42a8c6308.pdf?index=trueIn PDF document text
    • http://zuxebalu.rf.gd/muxegoxuma.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_877e06f61df44c4d8e0ec262004eba4b.pdf?index=trueIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_abc0d6c4e9844c7f8f7ce3cb9bb83025.pdf?index=trueIn PDF document text
    • http://fosupunejezaw.rf.gd/39024919094.pdfIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_e25a0391e0e84e28b3db0dd0095ffa66.pdf?index=trueIn PDF document text
    • http://ziresam.rf.gd/jazezudaxuwusuroluxepugo.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_509f3041227b4f12bf5f8d2a22b82cb3.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_232763c73ed04878850df0745beed1a1.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_dd9595e26c1d4776a27ca54d1d4d78b3.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_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 5156 bytes
SHA-256: b55d96bb35f34791b377ea6880220ad5f29886e18560e79508e3a9f2f51c4d76
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 11020 bytes
SHA-256: 135ecae2dfe5d1eff7624b923b2388c94115e55e8153399b6f8e95bc7e1c1923

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