Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3efb89ea97cb90…

MALICIOUS

PDF

93.4 KB Created: 2021-03-31 13:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8652f0f68f7917c7308a99d72f59f654 SHA-1: 28aa05000c8d445f2c83599f5a7e7bba8b7c44e7 SHA-256: dd3efb89ea97cb90a509fd00ed174fc53f312e338226534c80c58dda56ca57f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, with 'http://faceit.su/pobopisujufigokamufeluz175nr.pdf' being a prominent example. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

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://botokaw.ru/123?utm_term=breach+of+contract+template+uk
    • http://faceit.su/pobopisujufigokamufeluz175nr.pdf
    • http://profit-makers.club/ged_practice_test_mathematical_reasoningegfqv.pdf
    • http://itagreen.fun/vepuna4nmg0.pdf
    • http://quickstore.pro/zisusayhm14.pdf
    • http://idealslim-italiaofficial.site/dry_ice_blaster_for_rent_near_meiyl2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/71d00c19-1131-4b86-bd88-7adcd390a938/50_cent_50_laws_of_power_quotes.pdf
    • https://s3.amazonaws.com/wulagisi/76578072867.pdf
    • https://uploads.strikinglycdn.com/files/3650300f-419b-421c-b7ab-1b97f563df79/18884103758.pdf
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_c72b84b47c334a7eb58cd34677b28040.pdf?index=true
    • https://uploads.strikinglycdn.com/files/80604c87-391b-4898-89e3-446d3665e60d/65111894176.pdf
    • https://s3.amazonaws.com/davubewu/lumesidowadibe.pdf
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_8ba53cd16a384210ae62630f93452ad4.pdf?index=true
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_d7499fa9c5c744e38de0c9542d6b3386.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d5ac597e-1462-4f2b-9235-a427f29c12ea/46125538645.pdf
    • https://uploads.strikinglycdn.com/files/b62829d6-1e39-4eb0-a16b-1c30095aa155/dsc_1864_key_fob_programming.pdf
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_105e5274e3b04883aca65181e541eff9.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_off00012dc6.bin
f64d0aac2a83b294f7c9e85dc3bb4e2e3d701f6d56e640db0f3ca9d3396ed2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 5188 bytes
font_01_sfnt_off00013f46.bin
37eb190b5990f1b9232b8f6b416459a44451b91fa67d2b80524967b47e7e8918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 13632 bytes

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