Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1ceacb3666bbc0…

MALICIOUS

PDF

65.5 KB Created: 2020-11-14 16:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: aeb488d2dc3197783936ed038fb05f55 SHA-1: d3508854345bd91243cb560e1420b51fb61320ad SHA-256: 7a1ceacb3666bbc061b7108ee8910e3ee333479aab080d7b30407f422944b8d2
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://traffset.ru/strik?utm_term=dear+john+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5f97b3d84e345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384325/normal_5fa288f8ef47f.pdfIn PDF document text
    • https://jixevugoxoxeme.weebly.com/uploads/1/3/4/6/134625980/nekonikelijunejed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5f9bffefaeb43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juvetaso/7321638215.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/jumbling_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/kiwi_games_bloons_tower_defense_5.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/96377578656.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/65796033678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181cf488-6023-46b9-bd88-348f5cb7da7f/xizopikiraxirezigujaded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598762ef-357d-4058-9bb9-1a891c996c8f/zorisuvupewerosipesuvoku.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/pigomuxenusuliluxunufatu.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_off0000b976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB976 4772 bytes
SHA-256: 400f9691aed3cd8fabc3ef57f193a22b409f50291bf2f07fb45d256605d93b76
font_01_sfnt_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 9900 bytes
SHA-256: 7a3954b8bcb86ccf61f698a81c34edf4462d3c28362057ddbc357fd07dc3a39f
font_02_sfnt_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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