Malicious PDF — malware analysis report

Static analysis result for SHA-256 f185148518ab6835…

MALICIOUS

PDF

88.2 KB Created: 2021-04-01 20:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbfd31c326c262776643f5f861c9cd8d SHA-1: 59685d7a7362275a18966dab484f1e9b7af806eb SHA-256: f185148518ab68352ac77fd648dd32c506c54839a65eb07f72e23429a34a8299
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards malicious intent, likely related to directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=exveemon+evolution+line
    • http://sudilufib.getenjoyment.net/hippolytus_of_rome_apostolic_tradition.pdf
    • https://cdn.sqhk.co/maweveju/DfOogdV/blue_moon_ice_cream.pdf
    • https://cdn-cms.f-static.net/uploads/4491688/normal_605b74c726b8e.pdf
    • https://cdn.sqhk.co/jufenakajo/1hijdha/detective_jackie_mystic_case_collector_s_edition_chomikuj.pdf
    • https://cdn-cms.f-static.net/uploads/4374852/normal_604f9c53a92cc.pdf
    • https://cdn.sqhk.co/fapolokid/edgcCBd/beer_pong_table_amazon.pdf
    • https://cdn.sqhk.co/lasokixon/cgh7Psw/scarlatti_piano_sonatas_sheet_music_free.pdf
    • https://cdn-cms.f-static.net/uploads/4414864/normal_601c5ca15cf4a.pdf
    • https://cdn-cms.f-static.net/uploads/4460063/normal_603e51f39543e.pdf
    • https://cdn.sqhk.co/puvivefujef/jghaG84/62440936274.pdf
    • https://cdn.sqhk.co/nugilatunu/igd5Shc/21263636012.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/xagifajel.pdf
    • http://daravto18.ru/desarrollo_humano_autores_papalia_y_feldman_editorial_mcgraw-hilllh61b.pdf
    • https://cdn-cms.f-static.net/uploads/4493550/normal_6042042a16f55.pdf
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/304c3a0881eae1.pdf
    • https://muxivetifobuxo.weebly.com/uploads/1/3/4/1/134131670/zubebufejisa-kavodeto-fazibojoxekos.pdf
    • https://cdn.sqhk.co/jisokemefaz/q9gdhiM/rebuild_va_grant_login.pdf
    • http://dadevizevarek.scienceontheweb.net/rovatukijosamemup.pdf
    • http://s7hmus.org/killing_jesus_stephen_mansfield1tbtq.pdf
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/7522293.pdf
    • https://cdn.sqhk.co/rogudokives/zqiethh/sudikatamab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f4b.bin
9fd4196bfe3524b335434e4e0455e8ec761d922fa626f46900145aabebeb5f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 3912 bytes
font_01_sfnt_off00011d30.bin
537ea42f7934c88b7f50fcb19dd9fd13a8a5b4343b089ab5242e4542ea65b75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 4432 bytes
font_02_sfnt_off00012c3f.bin
4be6f1af139038956c6f4bd502787915b173cb6d11d16f27bab9be045fec22b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 11348 bytes

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