Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a963fc2c54623f…

MALICIOUS

PDF

61.2 KB Created: 2020-11-20 19:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b42fd169fa16916e879afdd58b08220a SHA-1: 908c3bd01ff0f5f2707d73a55ea1b5e033a2ea72 SHA-256: a7a963fc2c54623f6c806844b57c5e30d95d350eb8167ed550e1e5e9c3e08c05
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=dickey+john+m3g+manual PDF link annotation
    • https://kizifafub.weebly.com/uploads/1/3/4/7/134714450/pifopijulitujoroga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5fb005a316aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5fa978bf97b84.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/3db113cf-e0bb-4d86-a67d-9a1d6ff4ef31/naxetawinumebudazodisipuw.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/18864235815.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/36195285632.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/aimee_semple_mcpherson_biografia.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/buwejof.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/borimonirilijafujafol.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/87696751566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ce13338-1eca-4e7b-961e-256b6a942bf5/ruwanevegigulovotozuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4898eb03-a662-4d35-86af-f98301ec5bed/25017176098.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/galileo_galilei_sidereus_nuncius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fef034d-f41f-4242-b104-1cc944ecd0a0/pirobokugibepivig.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/daily_geography_grade_5_week_19_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/tamil_months_names.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_off0000b38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38F 5344 bytes
SHA-256: dcb1bca67fb32cc52f3470de767c80d57e4e0e4b976bcb9a0f7251ccd0614404
font_01_sfnt_off0000c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 10052 bytes
SHA-256: c18737a0929135c19183758e7c6854248e850bc63fcb4407a516e1a908f746db

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