Malicious PDF — malware analysis report

Static analysis result for SHA-256 498d3a4282fd2551…

MALICIOUS

PDF

81.3 KB Created: 2020-12-16 01:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c766549763294dcbebf27d6e866d161d SHA-1: b5f130524dfe4676c92c8c3abbb1e62b40f4ef6f SHA-256: 498d3a4282fd2551e0ba257381fd2d2efb784534205d43b638ff2d88ec4989d1
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 0.9997

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://traffine.ru/strik?utm_term=la+fitness+tempe+southern PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5f9dba8d6b267.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386095/normal_5fc9d028b0b96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8912f9b1031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f8ed9348bd37.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/4903077.pdfIn PDF document text
    • https://punulivolajes.weebly.com/uploads/1/3/4/6/134603903/bbfe7b2.pdfIn PDF document text
    • https://vexapezerizerup.weebly.com/uploads/1/3/4/7/134717078/durop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f97bde335b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443595/normal_5fabde03f328e.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/belopudevuzuza/pagazadakagujarebivakab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf69bc4f98375720d8a09a/1606379967170/bobikefem.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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 4128 bytes
SHA-256: aefef9aaa9f883216a5c28ed05eec6f68dec44f78194301a157095a2f7ca8b72
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 5048 bytes
SHA-256: f80d963fff8bbc416ca9ba3991a69d8706d801a19058b5a2aaad24f1ad4e2500
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 11180 bytes
SHA-256: 3e4f06531bbe3670b011a91e4d2cb9fa8e280d59598cd236a279ecb9bf83ec7e

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