Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51da98416ab5afe…

MALICIOUS

PDF

78.8 KB Created: 2021-03-22 00:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47677f75e46705217e180d0cae6d1029 SHA-1: 916296cc751866062bf5c9577127a3ad82f4cce0 SHA-256: c51da98416ab5afe49415d980277c367449f1a93971d5b89221c4d325db2fe5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=ikea+bed+frame+queen+drawers
    • https://static.s123-cdn-static.com/uploads/4413707/normal_5fdefe435cb4f.pdf
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5ff6ae0ef2740.pdf
    • https://cdn-cms.f-static.net/uploads/4412573/normal_602da1beb15a6.pdf
    • https://static.s123-cdn-static.com/uploads/4409623/normal_5fe32e4c43ca7.pdf
    • https://cdn.sqhk.co/pimetezefo/UmgjHbs/sql_server_2016_sp1_enterprise_edition.pdf
    • https://cdn.sqhk.co/jesovolavig/jh9jadZ/64955134220.pdf
    • https://cdn.sqhk.co/moxoxitij/EkbggQ5/28859653416.pdf
    • https://cdn-cms.f-static.net/uploads/4365562/normal_6023ab6a093f3.pdf
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5fd82b84e42aa.pdf
    • https://static.s123-cdn-static.com/uploads/4368505/normal_5ffa41331875b.pdf
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5fc601d31eade.pdf
    • https://cdn.sqhk.co/wanuvudeb/hdigl0Q/bima_howala_palu_kanda_dj_song.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_a3b0924af4bd4be8a0b86860870a8a86.pdf?index=true
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_7f3642c8362646f1a9696f18ac4af559.pdf?index=true
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_ac6fe5d77ad34c6082d230724659cd0f.pdf?index=true
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_d90e4081b4c54060a78ca4aff26f8cba.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_119347b98eed42ceb3c3c054b2659d1a.pdf?index=true
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_0a42bb1c0e044e9a8c888c062218f64c.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c9.bin
8a73349043c6c82737531f0b970007d6440349d42fa8f8ab94275627f91f9352		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 5380 bytes
font_01_sfnt_off00010813.bin
3336bec64a5f8e16a9b95724f7099ba36d560646b9c5fe77c7d6c79d6088b6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 11240 bytes

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