Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c69d9f9d3fb07a…

MALICIOUS

PDF

66.7 KB Created: 2020-12-01 09:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 36d4b719af2e9e23aaa931d891dd3341 SHA-1: bab2d5558bf8828c80bb1344ecc96b3409044892 SHA-256: 99c69d9f9d3fb07ae5f3994beac2f8d7af012694a6a565ab2cb0299419389068
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 0.9998

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://trafffi.ru/123?utm_term=hue+shift+afghan+crochet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8d81af71aa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5fb4d7ab2183a.pdfIn PDF document text
    • https://samoxaposem.weebly.com/uploads/1/3/4/3/134361226/ribemaf.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/e74c04.pdfIn PDF document text
    • https://nasefowiwawenug.weebly.com/uploads/1/3/4/1/134109082/f8774f549ce18.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/ximumipor.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/sigasanabezojopuved.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/nowokil/ph_worksheet_first_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/53558831625.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/xuwixifoviwoteru.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/59515431391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3d93355-1c25-4d7b-878c-e00b8a7edef6/pakowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5e9040-5df8-4fed-b55b-71c99219f08b/the_room_59.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1e53f3de5e49b52ce3ab/1606295124173/37468577673.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB916 4956 bytes
SHA-256: 93707e4a2c8e7803bd7df1a4dad6ca78092c66818cf93bb3b28ce6fa0d83c1e7
font_01_sfnt_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 11120 bytes
SHA-256: 8c5d821d75dc1d66c025852ff5be7efd9cdf8a920023b9cfe1a3bc6168643461
font_02_sfnt_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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