Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2719d65dc34738…

MALICIOUS

PDF

72.4 KB Created: 2020-12-02 20:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1718441f000f77e24ef208c36e14a3e4 SHA-1: 2480c96cb4a261ebbf0d3764a840b024231ac6bc SHA-256: eb2719d65dc34738e170c9dd32fb801986ff7e94d78616a9da25a6af02483f93
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent, likely phishing or redirecting users to malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=what+type+of+glucose+is+maltose+made+of PDF link annotation
    • https://murufafutebe.weebly.com/uploads/1/3/4/4/134473477/7f86faed.pdfIn PDF document text
    • https://tajuweselu.weebly.com/uploads/1/3/4/3/134362517/xaburonu.pdfIn PDF document text
    • https://jefapijuwenumik.weebly.com/uploads/1/3/4/4/134435530/rewakod.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/b77a10a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_5fb96b1cdb99c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_5fba5ced4d736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_5fb2c81e27747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5f8e128211070.pdfIn PDF document text
    • https://jawimuxuketeg.weebly.com/uploads/1/3/4/7/134763527/gebibewabofup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f8b9d3548508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426550/normal_5fc478c6cab33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5fb85b666807f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f93b0109ee40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf48464be903ae63f8262/1606218885793/72200766906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2356b510-26a6-4de2-a114-d73e788795b2/72651473363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44293c41-17a7-4e18-9cbc-c33312f14cac/pisakarowonexi.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 5588 bytes
SHA-256: 9a4f67d9855dc936272be2c6c57590429fe9f7021127fc3266a5334259360105
font_01_sfnt_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 12280 bytes
SHA-256: aa35bce6a317a20acc93808309582865068da7245d025cfc283319dd7b90efa8

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