Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afeb35154973a80…

MALICIOUS

PDF

69.6 KB Created: 2021-02-25 04:38:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0341a14b4e1a846d25e199601095488f SHA-1: 9fea6ea7b13144869e427548e1baa85d384adced SHA-256: 6afeb35154973a80d8819d0ef42985abca21d178993e95c314017dcba176b67e
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detection indicates it is a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to auditor salaries, intended to trick the user into clicking the malicious link.

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://seumenha.ru/wb?keyword=how%20much%20does%20a%20certified%20internal%20auditor%20make PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496225/normal_600d70940ad24.pdfIn PDF document text
    • https://cdn.sqhk.co/gidufulelav/g0rhhfN/tofu_girl_ad_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_600feb9a8be9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_6024ee35b0f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6034887f577f3.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/OgAIHhf/g_idle_world_tour_2020_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/z5ijhe1/98720891011.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/c4u6Cfy/hd_wallpapers_for_computer_full_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/Zihlsie/calculate_percentage_increase_or_decrease_between_two_numbers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390659/normal_5fd8cc527b99e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489415/normal_5fe355bd46fa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482854/normal_60009faf3ff3b.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/bulolimepol/89709847323.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/bm_book.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 5376 bytes
SHA-256: ce34fb5fa72a7a59de981ce5cd8ad30c5a1373d3e5249af9f6bb1ac6d8b16827
font_01_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 10592 bytes
SHA-256: 79bfde449214fe31f693e2f4c5b6882f1e08894a72399bbc63afce53b1e955fd