Malicious PDF — malware analysis report

Static analysis result for SHA-256 98034920db971fd7…

MALICIOUS

PDF

59.1 KB Created: 2020-11-17 17:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 160d0b38905533159d990ed9274443d5 SHA-1: 69426f7ef2320d0ae621bd63eed2f1094c1ec0bd SHA-256: 98034920db971fd7bf1d4b328aa95798070d9309d0079a937e147f60ffa4a708
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to direct users to potentially malicious websites. The primary URL, 'https://trafffe.ru/123?utm_term=covalent+bonds+gizmo+answers+pdf', is likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/123?utm_term=covalent+bonds+gizmo+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376599/normal_5fa05d667540b.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/fetijitefakuw-sijefedi-sowat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8c6699a0be3.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/9438865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5f90ea8c46f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fad825af2b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f8860e584fb5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/ginapetajinuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/adding_exponents_with_same_base_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/project_tl_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/motor_city_showdown_softball_tournament.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_off0000aac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAC8 5608 bytes
SHA-256: 2497b018f0055dbb3f0053e64b895780e8d3b2dded313b5965d6f4bc1de92ecc
font_01_sfnt_off0000bdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 9960 bytes
SHA-256: 3413c74f8dc1d3fa756f21c0112ceb1954084c74a498c94e96746e338fb16029

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