Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df70d7266b3153e…

MALICIOUS

PDF

81.4 KB Created: 2021-06-02 22:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f0c5381c73694bf60efdd23ee03d7304 SHA-1: f58e1e252d44d1dfa9a9bbaf5bad768332aba4e6 SHA-256: 1df70d7266b3153ea6c1283fed2e490fb6f57a6dd0ca806d3a7c9b18ad49d9e1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://chcial.ru/pbw?utm_term=stick+war+unblocked+at+school PDF link annotation
    • https://ditoramaw.weebly.com/uploads/1/3/4/7/134724618/pukoxutewapikep.pdfIn PDF document text
    • https://topekaje.weebly.com/uploads/1/3/4/1/134109010/limalas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5fda3273b48be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_601a7a3b032fd.pdfIn PDF document text
    • https://gafujewat.weebly.com/uploads/1/3/4/6/134687801/6064268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471475/normal_60469ef6b8868.pdfIn PDF document text
    • https://vunemagerubu.weebly.com/uploads/1/3/4/5/134525741/6499410b.pdfIn PDF document text
    • https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/d900e8f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486061/normal_60b1de56e5972.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/35437172bdf1c57.pdfIn PDF document text
    • https://vopipogumibuwel.weebly.com/uploads/1/3/1/4/131453394/7281574.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/f1ba1bbb-47d8-4777-86b8-1ad600d34d05/lg_10000_btu_portable_air_conditioner_instruction_manual.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/gba_emulator_games_free_download_zip.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144424209/how_to_forecast_cash_on_balance_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b4fc89-c8aa-4d6f-bbf5-9804d1199f89/19472791122.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 5428 bytes
SHA-256: 4b686ceb0ffef9e469ecf0b94ef8a176f3d5d569b9b9fa4a745c93dfa7b690c2
font_01_sfnt_off000111cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CD 11428 bytes
SHA-256: 6efe01fba18d515d3f128d96aa21a7fc74f10c9d88b42d62d1c858cc4f4cb94b

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