Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8fb3a1010fe31c…

MALICIOUS

PDF

66.8 KB Created: 2020-11-11 22:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9adc2960431c8d73a69174d5b6adcfc4 SHA-1: 9338ca04a88b3789861de26ac6eb5ce7348b8df3 SHA-256: 4c8fb3a1010fe31caa48cb6c1afdb2a6893fa898b3fda306ecbfc203432b69c3
156 Risk Score

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-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://traffnew.ru/123?utm_term=literacy+and+the+politics+of+education PDF link annotation
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/3e29cf.pdfIn PDF document text
    • https://jikevumuvovidu.weebly.com/uploads/1/3/4/3/134324483/c511b9b2d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f8c68a30ec54.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/dixebavof.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/3c2b2afb-1a69-4433-8a92-28e2950d2e2c/kadaguga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9418a3-ffc4-4705-b628-efe92afa80d8/kewajomezugojitana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5671717-afbb-4288-bcea-877dbe8c583d/34575202975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7391a9aa-8cb8-4a52-897a-a215f59b1298/boxikodakimejaseridisozoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fba3c96-2f63-4dfc-afb2-ecd38a29fed6/refatadunorajaxeruvu.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/lufupamibop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce83da56-e478-4a23-aa2e-033e82ae1441/download_the_sims_free_play_mod_apk_data.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_off0000c87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 5288 bytes
SHA-256: 38a93ee5b72eefef1f6514e446adf3144ce0124fc65a998785a7974677f0e6a2
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 11008 bytes
SHA-256: aa5991c1c39501a7cfc6ed29bccc129c7b969db76f67b1dbafbc434a7e9104b9