Malicious PDF — malware analysis report

Static analysis result for SHA-256 d197161def647e51…

MALICIOUS

PDF

83.3 KB Created: 2021-03-15 19:59:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e27ba36bdb4c37ed629e34254fe89234 SHA-1: 202c4cb4cc9bdc485f9e40e38f5a0a7158dff410 SHA-256: d197161def647e510d59815ac2e0745d63b725b4acbd736201402901ca2339ae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary malicious URL identified is zajinet.ru, which is presented as a search result for a common query. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=best+way+to+do+neck+exercises+at+home PDF link annotation
    • https://cdn.sqhk.co/kojariwirip/ggdqjbo/duvugozebatafurejoposiril.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/hjaI5jd/keep_talking_and_nobody_explodes_psvr_move_controller.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/g7chiha/zinisenamel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xupovobejanam/when_it_changed_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/beowulf_full_movie_hd.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_6d8945f4a51245ea99870f89a9244891.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_6aada8fa1e824641b97e9d3c8f70d5aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47040f8e-ec4b-4e4e-b445-9b32f8af5841/is_a_simple_favour_available_on_netflix.pdfIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_78b2414850f84684a766f903b7eeec83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/73376143284.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_c76b944c9cc44e81913dbe180dd735d9.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_7efc27f1aa4e4f1387433ac5221c38be.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_ec83cdc7e42249729d5dee6231186534.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a83a16d-83c6-4811-917c-24c28ff1c946/una_vida_con_proposito_resumen.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_fc3bd5c050e3498293d05f89685c2940.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setikizo/kobuxasiwokodugu.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_9f35f6bf52084f29bd11d905d4300729.pdf?index=trueIn PDF document text
    • https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_315ac01bf71d4562bef92e3070b663b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91811191-c0f3-4569-89af-609cba06ea7c/mazirezawuwi.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_65bfd74f68534495982ec4e074c91883.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_5118e60fed064870a81ecd3636ebd3cd.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 5308 bytes
SHA-256: 1a3679096968411b739bbc8d95bdcca29a2bd5e98412a55f4a285bd9e0b6899b
font_01_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 10968 bytes
SHA-256: 604b22e9cde19dcd9eba894cba33840179d0ca4dfa06ef3b07be8c26dd7a7ac7
font_02_sfnt_off000131d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378