Malicious PDF — malware analysis report

Static analysis result for SHA-256 679ac57ad2e29db7…

MALICIOUS

PDF

73.6 KB Created: 2021-04-22 09:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f41f501a9c107d1e3989530492da053 SHA-1: d7f64293e53a87db74de01fa5682aa4ded8096e9 SHA-256: 679ac57ad2e29db7d986b242bc98c067d4b2a080489c95035f7ba6925c14b1b1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign designed to redirect users to malicious websites. The primary malicious URL identified is https://resalured.ru/strik.

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://resalured.ru/strik?utm_term=uppababy+vista+rumble+seat+adapter
    • https://cdn.sqhk.co/xipepovivik/jcT4gRU/tokaido_tsunami_gi_review.pdf
    • https://cdn.sqhk.co/jiluputumusi/Vpj6hj0/22753897299.pdf
    • https://static.s123-cdn-static.com/uploads/4373987/normal_5ffe91c64b28d.pdf
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5fd8e6a5f0c00.pdf
    • https://cdn.sqhk.co/bevoletef/heicjhd/38115241418.pdf
    • https://cdn-cms.f-static.net/uploads/4467274/normal_5fdab27fa04eb.pdf
    • https://cdn.sqhk.co/nivunufozub/5haicib/16700070064.pdf
    • https://cdn.sqhk.co/kunimanujage/bijzlri/snes9x_cheats_android.pdf
    • https://cdn.sqhk.co/fegukajebaj/IFYjeC7/destiny_2_companion_app_classified.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_66b6534a2f5a485788a87226787637a4.pdf?index=true
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_806ae79117404ae28e84c28a6a78c0f9.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_613508c53f5c48d5bb561c360eacc088.pdf?index=true
    • https://s3.amazonaws.com/tubupejevomo/fezububofopobuxidab.pdf
    • https://s3.amazonaws.com/bidivo/54895471538.pdf
    • https://s3.amazonaws.com/suzujewa/47006433862.pdf
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_e1ef5dc514cd46ada015c6f026c5a3b5.pdf?index=true
    • https://s3.amazonaws.com/getizar/will_there_be_a_second_beautiful_creatures_movie.pdf
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_22eac9ebaefd47b8a201126cbcb40208.pdf?index=true
    • https://s3.amazonaws.com/falejogajir/59302397841.pdf
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_d9595441a5384156af1173c416c093a2.pdf?index=true
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_78f0d9d615124d2a838df85d0f8c2f35.pdf?index=true
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_163b77efdd4740dda262d47b2250f248.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_off0000deaa.bin
2617e13f2f2f8607db5e9558a6ad0deaf8d46e726b24637d4fdae82a2d160f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 5400 bytes
font_01_sfnt_off0000f0ef.bin
b0fc0f1967854f5c468ceefbcfa0e24b0a9bb3ae8852dd6cc7c5705fafdfd75c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 11176 bytes

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