Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d597dd477d3912b…

MALICIOUS

PDF

83.4 KB Created: 2021-05-28 06:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 999b7b39d7dfebe420da78467c02bec3 SHA-1: e8d79f3a7c5bb860770c9590c3a8f5a11dc3db15 SHA-256: 7d597dd477d3912bec5b2f19a64fa03bf487e2f982e3c7949ae31f456d8a10db
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://vilenefex.ru/strik?utm_term=comptia+a%252B+interview+questions+and+answers+pdf. The document's structure and the presence of many links suggest an attempt to direct users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=comptia+a%252B+interview+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420586/normal_60523530584ff.pdfIn PDF document text
    • https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/2a217f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_602ffc6b55c33.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/a4385379.pdfIn PDF document text
    • https://noruvejepemapab.weebly.com/uploads/1/3/4/7/134702548/629d88051aa22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_60395998e23c1.pdfIn PDF document text
    • https://wajupera.weebly.com/uploads/1/3/4/7/134763514/7776659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_6037d7edb4857.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/lerumerimix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6035575471cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_60644bff5f8d0.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/ddfd2a50d94b.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/jajiwimozexonafokun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449192/normal_5ffcc6c914598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_604148a8746f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07836061-4e1b-45c5-811e-1a25cfe07de0/liladutenozewemosanofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc23592b-be6d-4ad8-a074-72d516a2b933/myles_munroe_teachings_on_fasting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b67a2d2-fa71-43f4-bb4c-eb859eb6faf2/56368686558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f420c3-fdcc-43bf-9339-ef6b331ee99a/40264931554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03cf419c-7b66-4704-80e3-b16b6280d2b2/fisesikana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c83cc4-719e-4d45-a4b9-9f4f82788518/samsung_galaxy_s9_edge_price_in_pakistan_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb8338f-1c2d-4800-8b61-3fe75d2a708f/ford_escort_mk1_felgen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85eecfc-2ee3-4ae2-b1b8-c21fbc32d6b5/70044603942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0ab966-b6c3-4912-8af9-f538d9b2a0ee/where_can_i_buy_dunkin_donuts_mocha_swirl_syrup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d10c86-6c62-4f93-bf66-a6b33ad7a753/71170405910.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 5336 bytes
SHA-256: 039975ab3842f53b032c2c034f08ee77b4bd230c3dbe113351190e94105f70ac
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 11068 bytes
SHA-256: 922d56e44cfdd77da5cc6e01c1ae1b65513cad1e7128b2000bb5652addcf3149
font_02_sfnt_off0001298e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298E 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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