Malicious PDF — malware analysis report

Static analysis result for SHA-256 8def87e30392716a…

MALICIOUS

PDF

77.6 KB Created: 2021-04-30 19:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87e7a911a6ea2c913376a39c50cb6080 SHA-1: d1181efeb7fff5804394ed6b802d00ddee12e19c SHA-256: 8def87e30392716a3b311792673fbae783a5f51632361b72a3afc995fe9a5295
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to drive traffic to external sites. The embedded URL 'https://vilenefex.ru/strik?utm_term=how+do+i+reset+my+sub+zero+ice+maker' suggests a phishing or scam attempt by mimicking a search query for technical support. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+do+i+reset+my+sub+zero+ice+maker
    • https://cdn-cms.f-static.net/uploads/4484370/normal_5fda88ddad779.pdf
    • https://cdn-cms.f-static.net/uploads/4460946/normal_6025196a36dca.pdf
    • https://cdn-cms.f-static.net/uploads/4385421/normal_601996fb390a1.pdf
    • https://static.s123-cdn-static.com/uploads/4386824/normal_60014ccef1623.pdf
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5fd7991cce901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/90b54ba9-82f4-44ee-8587-546d8a27a19e/how_to_reset_quadra_fire_pellet_stove.pdf
    • http://ginowane.onlinewebshop.net/algae_thesis.pdf
    • https://s3.amazonaws.com/lowuwofuxali/bidoxugitepugobokerimasi.pdf
    • https://s3.amazonaws.com/remeranexe/sunawuzofinonulaki.pdf
    • https://uploads.strikinglycdn.com/files/e9d056ac-f127-47b3-b5f1-855ababe5c24/lugodasa.pdf
    • https://uploads.strikinglycdn.com/files/5f9a5f00-950a-4d86-97ff-60b4741df01d/what_does_family_law_include.pdf
    • http://jalebuvubo.myartsonline.com/sasukowivasewi.pdf
    • https://uploads.strikinglycdn.com/files/e49a627b-ed0b-4970-855e-9d42151613be/how_to_read_lacan_slavoj_zizek.pdf
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_edee8e1b679a4f43a08fec8787ab1813.pdf?index=true
    • https://uploads.strikinglycdn.com/files/59f3b09a-3bd0-420e-ad29-57b794f1383a/what_is_the_best_placement_for_a_carbon_monoxide_detector.pdf
    • https://uploads.strikinglycdn.com/files/3548c340-cec2-4fe6-a143-97928dde2c91/49179396575.pdf
    • http://gumomexad.onlinewebshop.net/vinefok.pdf
    • https://uploads.strikinglycdn.com/files/c3890953-3848-4991-b4ca-74a8a19c8100/ejemplo_de_memorandum_llamada_de_atencion.pdf
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_177811488a0d4be8b94786dd73aa27c7.pdf?index=true
    • http://vekejuf.atwebpages.com/lavazza_espresso_point_matinee_beverage_system_coffee_machine_m11121.pdf
    • https://uploads.strikinglycdn.com/files/e973e8de-e50e-427e-bb25-bb088e662c79/93137635671.pdf
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_f1ef3f2a7ac842f1a0a3ddaf8349b278.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_off0000f175.bin
750bd06a95d6340b309c08e46ae9b989ccd9b2ef9c916f9f1af7649a40ceb663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5460 bytes
font_01_sfnt_off0001040d.bin
0b77786def018d7d0ce9eb3c239811f585a0f02406176daed9514d5a4fcab4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 10796 bytes

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