Malicious PDF — malware analysis report

Static analysis result for SHA-256 d022536c3ec2dd3f…

MALICIOUS

PDF

135.0 KB Created: 2020-11-10 16:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7cdb6a4287c4970cfcb3b4d0a7d83e24 SHA-1: d36127bd205f86eb6f255eb28d9d607d2d2be9fa SHA-256: d022536c3ec2dd3f77d27573f1f5479fcbbab2655d52d9c8de4a464175e6b92a
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=round+and+around+we+go+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fa5f41a5705c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f8f1cce549e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f973a3487393.pdfIn PDF document text
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/wirudovob-ligaboforofow-gawanefax.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/04830c1d7ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f87073325bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fa56a327c3f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_5f88b56848fc4.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/6e29bae8-3b49-4dfb-b1f8-e2ed3c3f7b77/nugevonuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b07a00-6432-453c-a668-bd81bb4e5c7f/10181439275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b4733c-fb21-4ad8-b247-45fa887c7628/popefabapexadabagikowega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5caf62c8-2cbd-4c9b-8dce-7a4c16e7c013/m117_chapter_5_worksheet_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a78892c-03fe-4a00-8c97-a360bf57c388/rollercoaster_tycoon_hack_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cbc6151-84f7-4c38-87fa-1a71dc065169/identical_ellen_hopkins.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_off0001d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5A1 5060 bytes
SHA-256: 3e92237d641057a26673fdc649dcb0b464036ac843eb334a95bbbde72864dcc7
font_01_sfnt_off0001e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E700 12004 bytes
SHA-256: ad291879180c585823ea474822ae25f11e6749ff1dd306b5921a47f7cf4267a2

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