Malicious PDF — malware analysis report

Static analysis result for SHA-256 17978c0085b065db…

MALICIOUS

PDF

63.7 KB Created: 2020-11-11 21:14:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: be3fcc5a09401d1ef48547f01c6ec287 SHA-1: 9803c22003e8cebd88b86b9692f0b0f610553770 SHA-256: 17978c0085b065db5fc4fef719cdff6aebfccc1db3aa988a7d1de339e8cc9d18
156 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 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://traffine.ru/strik?utm_term=the+lacs+just+another+thing+free+mp3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416661/normal_5fa358ea59f3f.pdfIn PDF document text
    • https://sowosevutab.weebly.com/uploads/1/3/4/3/134311467/tavuzivata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5f90e74a28ec6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5f912a51a6664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_5f9b40dc677c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f8a8687d1f96.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/76e4e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fac1f273bb47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5f9f5b61b4adc.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/kizugokofo/the_blade_itself.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/user_input_python_3.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/balancing_chemical_equations_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/zabopoxazower.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/55757966546.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_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 5620 bytes
SHA-256: 3bd23f9fa05d9d0950180ad6ab7d818851e140f00946fd118a48aa1a0cfb1009
font_01_sfnt_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 10672 bytes
SHA-256: 0b5e097efb0f051358a40d3c6cd8148def629b9b65b28c3aec88c48cd8828bda

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