Malicious PDF — malware analysis report

Static analysis result for SHA-256 935bb5a22636fe16…

MALICIOUS

PDF

71.8 KB Created: 2020-11-28 09:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f88453d70423f52ca1adabc0a1ba880e SHA-1: dac668ee01ff99978d4a6e2da0a2838549f29779 SHA-256: 935bb5a22636fe166457fe16f53c9d70d623843b56bd27581bfa19e1467529de
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://trafffe.ru/strik?utm_term=kagan+cooperative+learning+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5fc1bedf3d2e3.pdfIn PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/735cb79da10e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_5fa31487d0b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5fc1e6fd49ab1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_5fb5d7a9acb7b.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/48e5ecea2e6c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f8fa1821980d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f998f1f7d468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_5f93ea1d1faf1.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/nujosuwemedadi/tipo_de_daltonismo.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/weather_report_in_india_for_satellite.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/35094295729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7893d9c1-c295-4d80-b259-08c378dab5e1/57729996517.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f7b565-6643-4333-98a8-5ef340669062/vupurusapefedewoxobetusef.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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 4960 bytes
SHA-256: b3a276228757939a06dd1abd5977dcd46a5f6bc4f4ecd29117751d3ffba7c795
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10800 bytes
SHA-256: 319493baedfd7484a71205e7f01a8f7ffb9e45d2161afcab951830610dd34269
font_02_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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