Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d474525b1baf103…

MALICIOUS

PDF

61.3 KB Created: 2020-11-10 19:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da951717ff6d4fb01938bebd2ce3f33f SHA-1: 1797e9aaaa73661c526bd0561f6e3ba6e16dc93a SHA-256: 7d474525b1baf1038f12603e56c97222ba0d2c2c76738e086057be5f76ff7ec2
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 0.9996

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://trafffe.ru/strik?keyword=dell+inspiron+8500+manual PDF link annotation
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/2747551.pdfIn PDF document text
    • https://zukinubugepar.weebly.com/uploads/1/3/4/5/134514864/remegogened.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/remelonidafaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_5f99c799590a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8afeaa08988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f99172683151.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/baxunaf/tobesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32af99aa-9bec-4210-8b67-aabe4e798fd3/zobewetika.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/purdue_owl_apa_annotated_bibliography_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689d3da3-ae4d-41f5-9959-85bd4745094f/chrome._exe_bad_image.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/kifapetu.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/bon_jovi_tour_2020_schedule_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fba28b5-1b47-4972-bb1b-a9514873be58/rpg_sandbox_games.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_off0000ad4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4F 5424 bytes
SHA-256: 4d7466bf9c5dc4030c687315d2d87df248e1d4d2297378bacb1fe2feb091bfe2
font_01_sfnt_off0000bfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB2 12216 bytes
SHA-256: 1ce1e420608ee2f17624eee94d2f5313c75e8c5ba2cf3ecd9cf93971bce887e9

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