Malicious PDF — malware analysis report

Static analysis result for SHA-256 9669f24909b0becb…

MALICIOUS

PDF

86.0 KB Created: 2021-03-31 21:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b60f74e72d4a39b700943933a2750c95 SHA-1: b323b57c0613c0fae54a3adf49d6582c77e4c231 SHA-256: 9669f24909b0becb663cdad00efaa46946560d86e60c74d7d23f77451d828365
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. The primary URL, 'https://dafemum.ru/123?utm_term=antibioticos+y+clasificacion+pdf', suggests a potential SEO manipulation or content distribution scheme. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence indicate malicious intent, likely to drive traffic or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://dafemum.ru/123?utm_term=antibioticos+y+clasificacion+pdf
    • https://juwopumunas.weebly.com/uploads/1/3/4/0/134096214/4087389.pdf
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fcc465d4257a.pdf
    • https://cdn-cms.f-static.net/uploads/4470401/normal_601ae19d5f5b8.pdf
    • https://bobusenig.weebly.com/uploads/1/3/4/8/134866704/10b9c26f.pdf
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fd0391e5ee53.pdf
    • https://cdn.sqhk.co/vimerokil/ahcJ2gg/lipoxarifagibovirogunil.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/86d95c.pdf
    • https://cdn.sqhk.co/zimopaji/dihheqH/war_of_destiny_help.pdf
    • https://cdn-cms.f-static.net/uploads/4495392/normal_60147e036705c.pdf
    • https://pujowuvorokom.weebly.com/uploads/1/3/5/3/135347933/79ca2c1623237.pdf
    • https://cdn-cms.f-static.net/uploads/4402533/normal_604a9115e4fda.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_601dd89c75568.pdf
    • https://cdn-cms.f-static.net/uploads/4488604/normal_6056f54836aae.pdf
    • https://cdn.sqhk.co/viwiratoposu/pgdHgdv/energo_team_spin_blade_elite_10-_30.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_ae1c3f1047a44dd0aa7a0510ac7a85ba.pdf?index=true
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_23ca5f492e124089ad89e5f987af57e1.pdf?index=true
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_c450f4abf86a4e1eb205600228bea07f.pdf?index=true
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_f654f9df8c6a42ac95fb05a8a67dcb39.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_9b5d9518363e416fbd9d23791c40162d.pdf?index=true
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_ba335ecf51ab492188d922120a4b8683.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f3.bin
adf1c273e89b837155434dbe2f2aa970e10bf7187bf3162c6b2ddef088dd6dad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 2064 bytes
font_01_sfnt_off00010c3f.bin
1b442ea61b52322d6ec42600ec07b70f826c8534f074c0b0a66d06a8301c3d8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 5284 bytes
font_02_sfnt_off00011e5c.bin
18ad1e2dc420b983c2c6e626de39d1c9a0f134f45a598c248d9be0f12f340ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5C 12960 bytes

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