Malicious PDF — malware analysis report

Static analysis result for SHA-256 291c99b4db84f6c3…

MALICIOUS

PDF

81.0 KB Created: 2020-11-25 18:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1922eea4a96de5abf23d9d9e94e5a7ac SHA-1: dea2e8082bb0c2840a27b5ae9ec88aceb3dff847 SHA-256: 291c99b4db84f6c3daef95eeba7f2c5e4f0d155138523941925d04ad1fa6b9b2
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/strik?utm_term=function+notation+answer+key PDF link annotation
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/tifulugixerinosive.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f8e23ed232f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481665/normal_5fb84007563dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_5fb59b0f0dbbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/86b16c3c-b68b-4df7-a3b3-d2c97e2cc3ea/41066235229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e54f7f1-f887-45fe-adf9-41f5b25d64a3/simple_past_exercises_word_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/damevusom/8120884195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5347689-9d3d-4253-9097-ab3c99dce669/32241714250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c7a0af-8948-4173-b055-22d453565219/jebenadijegesurug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/576439e8-7ce0-45ee-969d-d4c751b805dd/lejozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc4b83c-783e-467d-83de-9c9e26848233/pununupoxumaxogojufomed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1db9f74-34c5-459c-b4ce-3a73da9b9b34/12684508119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28112af0-ab4b-4945-8e16-0fad1d94c015/42575771553.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/mv_agusta_f3_675_engine_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 4856 bytes
SHA-256: c3ed8f4ac5e652c282d4535cf648a169ccaf8562e83d6d3077fa2a4c4d7b1370
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 11232 bytes
SHA-256: 245cd24f7a18fe16ec26772fdd230f7e70702477da93301ad826e573d80831b5
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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