Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e921351e7eccabf…

MALICIOUS

PDF

97.9 KB Created: 2020-12-24 02:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c6980d645b62fff331d87d47bd176d50 SHA-1: 85c68f59d16bd3035a6d23416894b2b7579e02f6 SHA-256: 3e921351e7eccabf9dcb4a2d7b8ef0bd52ac30d8e76905f53155e071dbdc91f3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/strik?utm_term=2020+anime+list+wikipedia PDF link annotation
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/fifawabumafe-natev-sovesikade-rijipimedalomil.pdfIn PDF document text
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/poritir_zebon_xowefon_xejago.pdfIn PDF document text
    • https://pozujejax.weebly.com/uploads/1/3/4/6/134679154/kalesukipupujuguke.pdfIn PDF document text
    • https://bumarotijij.weebly.com/uploads/1/3/4/6/134688095/vasapu.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/vibuxejelale.pdfIn PDF document text
    • https://nusekaturorofu.weebly.com/uploads/1/3/4/0/134095869/2b198cbc067.pdfIn PDF document text
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/goluvitogap.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/1399784.pdfIn PDF document text
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/a96e00.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/6eda6022-ff46-41a9-90e6-9535e1fbebb1/file_stdin_line_1_vscode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f8ece79-b103-4d41-9bee-5efc9bebf027/gulf_coast_prairies_and_marshes_plants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f500899f-10c5-4e60-a094-0685c4c3e26e/ziekte_van_crohn_symptomen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6741dc-8f90-410e-b6c7-e3912e5659f0/eagle_creek_guide_trek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff41d5c-4181-45a2-9ab7-80fdf53115e9/88916022393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5caef990-0cb5-480d-8619-d046c8bc270a/xubijuxaxekanabusufoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbd3182-601b-4264-915a-48e1d96c8f99/area_of_rectangles_triangles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be3ab21-9124-47c4-86b9-3f89e42698e3/15444380884.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001474f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1474F 29200 bytes
SHA-256: e013fc2365b5494172761b68ef5879df8193926d2c7f7582a258374bf782e483
font_00_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 5344 bytes
SHA-256: 7299b672befb385e37011ede7faab364a2c5de5e1a313d2bb18e6df4a6cde5e5
font_01_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 11228 bytes
SHA-256: 342fece9d47003e17a4e9abef2ad3c10eb5172591694b35cc236266ad854a141