Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff58c0bcc5c168be…

MALICIOUS

PDF

78.7 KB Created: 2020-11-24 23:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 768e5e05f2504f6102dd4f6dc8abbf01 SHA-1: b73ef7baebb104fcc57151dfaa077b925936664d SHA-256: ff58c0bcc5c168beb75b6c284e0dd79a71788be100f6c2ba44e7236cb4bc7298
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://trafffi.ru/123?utm_term=ark+cheat+codes+nintendo+switch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f8879d1809ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_5fba068458a67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8c0710b42a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5fa924c9d5386.pdfIn PDF document text
    • https://vojitimene.weebly.com/uploads/1/3/4/5/134596684/sizugujipexunoze.pdfIn PDF document text
    • https://dukitupa.weebly.com/uploads/1/3/4/3/134393571/2b260f53941e923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_5fa39c45dcb8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f90549e4effa.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/8530117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e34444f-31c7-468b-9bad-7585910d5b10/rod_of_negation_3.5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac10639-d940-4a35-9a73-0c2cfbcf39df/sodusavoriganamuwatoxafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f20692b-5872-488a-82f1-9696f0ee7cce/samoxijopedup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88a6dd9-5053-4a51-8528-673649be5905/rapuxekiwiwomekopisod.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_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 5140 bytes
SHA-256: dd6e77ca468ceca41fc046e4ea4df646f1dd9dea7b037d9a19750dd5f26e02d3
font_01_sfnt_off000107c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 11588 bytes
SHA-256: f8c2c8cad1446f50c3db3ccea3acac073f88ef51858096801e1f4b59337251a3

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