Malicious PDF — malware analysis report

Static analysis result for SHA-256 8415854e215aa4b8…

MALICIOUS

PDF

72.4 KB Created: 2020-11-11 19:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ab977aa7dfbcfd660c61d81299137432 SHA-1: dc9938b4bf73486835294e4a809c45d1e59c8900 SHA-256: 8415854e215aa4b813557eba2c0bb7c0502b13fdeaf8f2dfba6b2fe7c376f442
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://traffset.ru/strik?utm_term=mercadotecnia+1.0+2.0+3.0+y+4.0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408712/normal_5f9393f6519d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f998b9d21ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_5f8bd65322909.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/lokebuxusajukos_fejerir_desesuw_lofitovozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_5fa1c547a836d.pdfIn PDF document text
    • https://sajugolev.weebly.com/uploads/1/3/4/4/134463158/guzafivufozatuvugeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f8e0ac966ae0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_5f925fe715443.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/6142589.pdfIn PDF document text
    • https://ziwodenitisal.weebly.com/uploads/1/3/4/3/134350364/3993253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fa5fe6c06b0c.pdfIn PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/wosutad-gobonova.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/jazuravazaguz/18143946473.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/character_arc_worksheets_for_writers.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_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 5440 bytes
SHA-256: ed44c30c2a16285d1106ed52f777f9a4dc30401088889b599f7ab445f57d6eb5
font_01_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 11188 bytes
SHA-256: f3362e2d2fc0391b72549d9dfb5795426a07bfccb6344f47a26b4bd9b4257442

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