Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1cda7cac3e2225…

MALICIOUS

PDF

69.8 KB Created: 2020-11-11 00:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b113e2ec6ffd22850927182ca15a3ae1 SHA-1: 1fa31acccb6e52cfc4f4ed5db1cff3807c7ff60d SHA-256: 5f1cda7cac3e222529583f3a3cc0ebdf42a90d739bf5131853c6abf0a3998865
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/123?keyword=hotmail+inbox+mail+sign+in PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5fa022b9ede7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403263/normal_5f959f66bb0de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f8c05dd3bf0f.pdfIn PDF document text
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/jiwawatex_vugasipose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_5fa890a6cdedf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5fa457d168f8e.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/guwen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8f00f84aeec.pdfIn PDF document text
    • https://wilubowedawiwo.weebly.com/uploads/1/3/4/5/134528918/870062.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/jamokaroxoj/composite_figures_area_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/97364531921.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/2022940862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c38bc9-39cd-460a-b62a-efe0639e80d7/44669738178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f0acdbd-5be4-4e8a-9f4d-cd32960560a1/44778397156.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 5076 bytes
SHA-256: 1e05c195b3c3ef52bcf9c6325a216c0a7c97622470aacf366a85a85acb86bb09
font_01_sfnt_off0000e85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 9984 bytes
SHA-256: b011228227a08232fedb4632a46ca8e5ffcbcb50bcfb01e1f357b7c56449e14a

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