Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfff6a91a26d831…

MALICIOUS

PDF

71.1 KB Created: 2020-11-16 13:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e343394ce661be684689caf85cdfa82 SHA-1: dfaab582f81dc48409cf8a8681fc646df21c0e31 SHA-256: fcfff6a91a26d831ae8458d2e56540aaa011b23dfd10d99288fe145229c108e0
156 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 0.9997

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://traffking.ru/123?utm_term=where+to+buy+por+15+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fa6e02fe2b59.pdfIn PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/7017624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f8cb34953904.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/1c3c686e-2049-4a64-8ced-28f2aa6edd42/dental_hygiene_pharmacology_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552f498f-2043-4218-9fd5-f3cb62a41113/xiwuwenabun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26259010-905d-4b30-96fa-7ef8950ee905/5685678416.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/game_engine_architecture_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/lotipafemibun.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/traits_of_the_holy_spirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55596f77-e3aa-4d0e-b52c-c2c0e3e9276d/2539559847.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/85185987247.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/equus_magazine_submission_guidelines.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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 5340 bytes
SHA-256: 783c22f0abe67e6f45335b9c2e5751c0421342b58166741608345de1a196b311
font_01_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 11352 bytes
SHA-256: 20db0840846d0e3d2beaab528dae6967949cbebb85e7eafe08ac985ccf9b6beb