Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8b9d233fca939d…

MALICIOUS

PDF

67.1 KB Created: 2021-03-25 23:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a5802b91715eb44c4b137a1c2a2613ec SHA-1: 615aa2a4b4ce114fa9fe18e8906b69f83e4a2541 SHA-256: 7b8b9d233fca939de10cd33a03c799a6d36644b4f4ccbff9af8f359b7fdb5406
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'resalured.ru', which is likely part of a phishing campaign. While no scripts were directly extracted, the presence of embedded URLs and the nature of the detection suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/award?keyword=smc+air+cylinder+catalog+pdf PDF link annotation
    • http://bumaga.bz/98127922069f7i1j.pdfIn PDF document text
    • http://tb-films.ru/str_dn1050_remote_appricab.pdfIn PDF document text
    • http://luxshop21.site/naruto_shippuden_op_song_download4bm6z.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/tbgdXjd/zesuxuxinuwimuvibimo.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/JgdfJ8C/soxasetaxepofiruwepugi.pdfIn PDF document text
    • http://gvidilon.ru/dowujorifotesfhtii.pdfIn PDF document text
    • http://eslivdrug.space/financial_reporting_standards_nzrlur5.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/d6edcae0-e986-47f7-931d-9485ac8ab9b7/zelita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c47a5d7-d5d6-40f5-bb52-97afeb004b64/90651308291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41da7e78-4de2-41ac-85da-bd00c4c1ffab/39591204728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f2db67-3534-49e2-a2ca-9952c7e57159/kafewovajojawix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c271ab4-3f1c-438a-a568-95b664579e48/fawisuzegefelimomivofed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c8dd4c-f177-4af0-aac4-250c5aa8e3fa/49006520881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0adb22f5-76c4-4b44-9641-9be0e0966f27/20302093267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f99bb6-8aa0-4720-979f-0ad68543ec4b/94796127246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e0a036-762c-4b3d-8fc3-7cd09ba75084/3804279173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b641056b-fe10-4983-8d4c-8b4453ffae35/xuwuwufogolalatewonoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97896b46-b970-4347-9326-73fdf1a471fc/6461417384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec5a735-b72e-4c9e-8476-0ad121316967/40894666647.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_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 5504 bytes
SHA-256: 5c15b1da757d1bc97f74134e7de2e991ff99f1007c004d919eb63bbf2b9ad642
font_01_sfnt_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 9884 bytes
SHA-256: 5d9722da536a52107237190f7ca5e6ed67efd61b92d2d82dffeb4b7c9e0c9e4a