Malicious PDF — malware analysis report

Static analysis result for SHA-256 8529f4e1b9d378a4…

MALICIOUS

PDF

91.8 KB Created: 2021-04-01 17:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44649e1c3438f4de1bd3745549b42bbb SHA-1: c93c005f916ebf2bce7cf1bfe60c398d600bbd22 SHA-256: 8529f4e1b9d378a48cbc2e62e6c4e2b93460d3181f44191264f81094c092f24f
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/strik?utm_term=what+is+hologram+in+simple+words
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/345171.pdf
    • https://vafumesaz.weebly.com/uploads/1/3/4/5/134589630/nijutezobanube.pdf
    • http://bodyita.space/32601934283oq28u.pdf
    • http://meetly.space/all_clad_slow_cooker_cast_aluminum_insert_replacementbxgho.pdf
    • https://cdn.sqhk.co/weretesa/ehepjii/34258980216.pdf
    • http://juzezudusota.mypressonline.com/50696281291.pdf
    • https://cdn.sqhk.co/nawakema/czSk6Kt/90589632925.pdf
    • https://cdn.sqhk.co/forinabam/vFjbMja/gavaxumisolasera.pdf
    • https://cdn.sqhk.co/sofilita/f3hcIji/80152706320.pdf
    • http://thelandofbadideas.com/suxonolobipombz99f.pdf
    • https://cdn.sqhk.co/xotolodi/dicKtgg/muzomomuxixujeruz.pdf
    • https://cdn.sqhk.co/fuxuduxexi/H8n0ihh/the_walking_dead_season_10_episode_13_michonne.pdf
    • https://cdn.sqhk.co/dajebala/ZjiTAcw/96386268871.pdf
    • https://cdn.sqhk.co/mugodetutag/bhguido/zakatokerubifumilaxofa.pdf
    • https://cdn.sqhk.co/fakosopalo/f4oIvji/95698200884.pdf
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/8899dc8e563.pdf
    • http://walolexokesufa.sportsontheweb.net/bergey_s_manual_volume_5.pdf
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/suzeguteperuso_bowexekozike.pdf
    • http://gbo.guru/what_is_pharmacology_class_for_nursests7fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zamuriza/76743587678.pdf
    • http://vawerudarasikow.myartsonline.com/caida_libre_problemas_resueltos.pdf
    • https://s3.amazonaws.com/lukepepe/lightroom_free_for_windows_10_softonic.pdf
    • http://gitodake.myartsonline.com/48482635105.pdf
    • 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_off000115ca.bin
27d264471da5acd82dcb07db8ca2d4fd0a8750d09ed1b0cc71780ad5e019fe96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 5268 bytes
font_01_sfnt_off0001279c.bin
a91712cac689995e2ea51210b578eb4f4352cc2be548d97450961498605be785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 12748 bytes
font_02_sfnt_off0001520f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1520F 4324 bytes

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