Malicious PDF — malware analysis report

Static analysis result for SHA-256 720e8ad8b6cab786…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 22:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 74c72d52c058bf251fe70763417c1f45 SHA-1: 5600aa8921aa2f76c73f0ebf0da385709fe21318 SHA-256: 720e8ad8b6cab786e32588321ab0c90d716f98aac90753a90bd36fed38b85973
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fokemale.ru/strik?utm_term=tipos+de+funciones+graficas+pdf PDF link annotation
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/taxivunabifagesaxoxo.pdfIn PDF document text
    • https://vamugibamapiju.weebly.com/uploads/1/3/4/5/134588186/dipadowilamumu.pdfIn PDF document text
    • https://sojenakituvewo.weebly.com/uploads/1/3/3/9/133986345/9864028.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_601bd1e66c320.pdfIn PDF document text
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/zewagutazivusux.pdfIn PDF document text
    • https://noverike.weebly.com/uploads/1/3/4/3/134349253/2f914b315.pdfIn PDF document text
    • https://wuluvaxezipow.weebly.com/uploads/1/3/5/3/135393263/zunafiwogufiloj-navetikazarizo-dutexu.pdfIn PDF document text
    • https://gomosoganerat.weebly.com/uploads/1/3/4/4/134494513/5e8db186d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5fd78422c00e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ff4e1067aa7f.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/ac096bc7-75b9-47dc-91c1-ae1597247b98/does_stealth_attraction_really_work.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_59e116ced955442f998fe4ee682376fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ceaf2b2-e99e-4b73-8656-e9d65f11ebb0/59954851762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d090a275-b5c8-4a5a-8252-3c7a11997542/vufixaletojisaragago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1c24c1-2c61-40e2-8797-04426c2ea890/luwarakodaxulaluz.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_ec8c7f4cf52a4663a1871f07497f7c37.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_c00c1beae0a74006b182a1d90f181b9c.pdf?index=trueIn PDF document text
    • https://60ceb029-6f78-4d42-8ea4-15ca08d8077a.filesusr.com/ugd/857e61_4dd27c6c4e954ea28bc12abcb821386e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce12d80e-bb0a-45da-bca8-4c1ca5d9be2a/how_to_charge_my_mophie_powerstation_xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c2ab73-71ce-4c7e-8315-d771b9cd9f46/3872916578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed765f11-bfc7-472b-a48b-1e3271f22fa5/insinkerator_badger_5_garbage_disposal.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 3072 bytes
SHA-256: df3671ddddf44ce137e8a120fe9ff4f7c653184490bea203b8f2be18a8455e95
font_01_sfnt_off0000e1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1ED 1696 bytes
SHA-256: a63dc7203ceba2031beaf1d50b83973ffdd0483474384fa5780efc3deacec6ca
font_02_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5240 bytes
SHA-256: d4bb9f43ebc618712f17f8ce0dca069d2055e4eae994e1dcf2999b5b9aa066ad
font_03_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 12324 bytes
SHA-256: c3478f2066a1b60e8f17af6141d8473f649115a3357afc817ee06ff9616f7a13