Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a87aef23fa099c6…

MALICIOUS

PDF

66.8 KB Created: 2021-01-09 19:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7b2579416801f2bebe3963b80f6d8b9b SHA-1: ef33e3ecff6bba0f2c45f9e7d0972ac37a3bb88a SHA-256: 6a87aef23fa099c6da755c7723a9a144a3d04c2cd96efd708a23e20c08049123
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing obfuscated content and an embedded URI pointing to a phishing domain. ClamAV and ML classifiers also flagged this file as malicious. The embedded URL likely serves as a lure to a phishing site, attempting to trick the user into believing they are downloading a manual.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=canon+hdv+1080i+manual PDF link annotation
    • https://site-1175656.mozfiles.com/files/1175656/zejuwifogunovigonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375907/normal_5f8ad2eeb0d01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471683/normal_5ff88bf399aaf.pdfIn PDF document text
    • https://site-1178320.mozfiles.com/files/1178320/89458230814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473938/normal_5fc98d427cb62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_5fa8f80e5f378.pdfIn PDF document text
    • https://fotelixufigowex.weebly.com/uploads/1/3/1/0/131071188/mosabofoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402707/normal_5fc4533377306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/49780298551.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/putejuje.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/bsc_courses_list_in_tamilnadu.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_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 5144 bytes
SHA-256: 845f8cb400660d0839570adc3d09ce4c6b74c35757405f8c47ae6f8f4294bac7
font_01_sfnt_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 10616 bytes
SHA-256: fdec0bac211424db7fd15777691530e67708ef142320e64d150c01ac62e099bd

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