Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36085397b22f5f1…

MALICIOUS

PDF

65.0 KB Created: 2020-11-10 17:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6a898d084cc35c06d4d2ee02710a43fe SHA-1: de9515e1512d15622af3191618adb914664f0627 SHA-256: e36085397b22f5f1305f18d3f18377e3c54bb295889e1303ba28359a8eedd999
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 0.9995

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://trafficel.ru/strik?keyword=aprilaire+400m+installation+manual PDF link annotation
    • https://risebezisenozo.weebly.com/uploads/1/3/4/3/134375164/girirurofup.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/53755d7d-172a-450a-a2ea-dbb51a3a476f/jotivonikemibe.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/65943638939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413b76e8-b773-4874-9f36-cef634aaa0c9/59477625583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de25902e-bd7b-449a-80b5-5f25b28ebb2b/vehicle_modification_station_fragments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719d085e-c505-4262-9bc5-d4bc65a90200/free_cvc_words_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd72fc9a-a0e9-463e-831f-0517b80af8b1/36455018291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917e67f4-4f3e-4f34-93f3-1dd299741575/curious_george_full_episodes_pbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7141ef-136a-41d3-ad68-dbaea90b3913/lapuda.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/86250325313.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_off0000c0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 5184 bytes
SHA-256: 233b2bfc2fec4e0b1b3efd9a2479b497b309c9a4148737c9782d9f27454fae6a
font_01_sfnt_off0000d280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 10932 bytes
SHA-256: 67ec5f703e22f1a6a92bf0cb8c7159aec8a2ae68428718e89d257bbdcb61b915