Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64a7acff819b61e…

MALICIOUS

PDF

61.1 KB Created: 2020-11-11 12:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a36c3e8f5eec3e683c97251c8e3cf1af SHA-1: 98ba38ae4cd73b9f0141b3787d7e26d7a9ce66ac SHA-256: b64a7acff819b61e9a60451752afc6dc1d2e50e87212525581313efb91abff27
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/123?keyword=unblocked+clicker+games+github PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379053/normal_5fab9e5b146d3.pdfIn PDF document text
    • https://suxasamivozafe.weebly.com/uploads/1/3/4/7/134705269/tiwaxolatirefogid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8706542431a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_5f91519ab2c93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5f8765669e6b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_5f8ba85d55c4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_5f97d6dc039b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5f96333dd7a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f930e0f0bb34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_5fab35a50e944.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/84da3.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/zupenafud/epson_stylus_c88_printer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/62414599828.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/83563802076.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/45378145636.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/fuvuridovitu.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/6260052060.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/76462239605.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 5548 bytes
SHA-256: c34f0ce8604c2d0f60fe614c961b27c9b0ac5173c2831267402ba888b46c31e1
font_01_sfnt_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 10112 bytes
SHA-256: 9657afeaae67f65b5bcbdd05dbe7a18a5f0ffc9f20a056f15e7d15dc08b4c513

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