Malicious PDF — malware analysis report

Static analysis result for SHA-256 98efbc22160acb29…

MALICIOUS

PDF

74.1 KB Created: 2021-05-30 07:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f896fe0d14140b466dc3fb2be65d55f5 SHA-1: c453667f77b9c282147eb251b6b8cdb88c4ed152 SHA-256: 98efbc22160acb29fcc3e5b41761756680fc3169d8ed9c5cab8218dd018c5937
196 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. It uses a password-protected-archive lure. 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 0.9997

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/strik?utm_term=ashokan+farewell+sheet+music+piano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601bdd5dd4954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5fc62e3ee1c94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fc8c14cf4070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_6002def32f5b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_6066665789756.pdfIn PDF document text
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/7353316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5fd67f25d05de.pdfIn PDF document text
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/lanaroz.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/fejumibepoguvazewifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_5fcf49e08dd1a.pdfIn PDF document text
    • https://zugatesek.weebly.com/uploads/1/3/6/0/136082504/zaperifax_zagiradef_fogomomutiroxij_minexoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_6009e7dfdf92c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466151/normal_5fcf40ac21db7.pdfIn PDF document text
    • https://sirazetagur.weebly.com/uploads/1/3/5/3/135328448/2117380.pdfIn PDF document text
    • https://rizowowomupi.weebly.com/uploads/1/3/4/3/134344214/d6299590941.pdfIn PDF document text
    • https://womiridiwudawap.weebly.com/uploads/1/3/1/4/131408248/nedadapuzuxux-sovamed-winikede-dowidinipepug.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/9da5fd1a-11a7-4f46-b35e-e4ac0e85949e/how_to_remove_bios_password_in_lenovo_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a3d9c3-4aee-4f22-920a-8baac4f6b740/social_psychology_books_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194e259d-e18a-470c-9b4e-0ad1859af343/how_long_to_use_oxygen_concentrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f915b8-d4bd-49fc-8571-89c867d11c14/what_is_special_education_according_to_different_authors.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_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 5400 bytes
SHA-256: f9062520f1ea3c8b4ad8c94b402e1c44194fc1501a05485641f080a822463f35
font_01_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 10640 bytes
SHA-256: 68fbc64a3b95777c2eba94f880451183548ace9c288ed7b7b8783bf713919396

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