Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63d0252fc61f205…

MALICIOUS

PDF

63.1 KB Created: 2020-11-23 23:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cc3259f0758ee44b8c0c4f90aee7dbdd SHA-1: 9cf5a5a785aefa7cac70385aa7d875b9a9c36ab7 SHA-256: a63d0252fc61f2051edb8d09314105b92523c0b3c71a40619887ca0f2aaf462b
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/strik?utm_term=starbound+protectorate+symbol PDF link annotation
    • https://rurefidutemajob.weebly.com/uploads/1/3/4/3/134333690/980813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_5faa6b13d5bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_5fa615494a070.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/643799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_5f967c77e71d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5f8de74e396fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_5fb576bb9b99d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5fb70b882dc12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425211/normal_5fa2396c5c2d4.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/paxuvagal/rivajigofoxajawomoxok.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/19336213605.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/54856557243.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/kurewol.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_off0000b8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FA 5564 bytes
SHA-256: 724c1e1e2d3af34e858c19579261ccec5970550e82f6ac64508deaad52a0fcca
font_01_sfnt_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 10528 bytes
SHA-256: bcfa62c5a25cfafdb51ddc7d431ce3c997e01a32832be88d0ee32f0af37ffb7d

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