Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f635fb7f8c6b3f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-30 07:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 071038c5272f92b49c4091329b983ade SHA-1: 568bbfa0ba55600882072cb2980c167af221eb4e SHA-256: 24f635fb7f8c6b3f5a5340e46fcf832b6e17bcb3bcec41a37d1d7e1e7abdc1c9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The embedded URL suggests a lure related to job applications, indicating a spearphishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards a malicious document designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=job+application+form+pdf+format
    • http://tonemisi.medianewsonline.com/31857406582.pdf
    • http://websporizle3.com/641517670155ofr0.pdf
    • http://yoptan.space/sketchup_make_component_shortcutq7nh0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rizezobabub/new_af_service_dress_uniform.pdf
    • https://s3.amazonaws.com/gixirojozogufux/62074140029.pdf
    • https://s3.amazonaws.com/wutezigojuxi/ordinal_numbers_worksheet_for_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/4eafdfbd-b23f-4cf9-9b2a-1122592adc5f/taviliwusozixisutomiratam.pdf
    • https://s3.amazonaws.com/tumasun/40991794335.pdf
    • http://gudugapapilile.atwebpages.com/electrical_safety_audit_report.pdf
    • https://s3.amazonaws.com/dazutun/whatsapp_plus_v6_70.pdf
    • https://s3.amazonaws.com/piwanisaj/5088720922.pdf
    • https://uploads.strikinglycdn.com/files/c9888c03-c504-49ad-a0e9-a7ae8b9b3e62/basic_spanish_grammar_rules.pdf
    • https://uploads.strikinglycdn.com/files/3832791a-72b1-4f8b-8e93-f95810220a49/zizamatopopedatopelu.pdf
    • https://uploads.strikinglycdn.com/files/57fcba3b-f74a-43dd-ae74-cd80975dbbe0/vivoxevebigisawuw.pdf
    • https://uploads.strikinglycdn.com/files/e6e06d30-c78f-451c-aa3a-275da7e5763e/is_innova_a_luxury_car.pdf
    • https://s3.amazonaws.com/davolazupivowi/zinefiragugilunaluzo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d5.bin
1f774a4ef728a504cb972c24483636aad2ba7106ff6fefe8fd5042a82e8f7852
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D5 4924 bytes
font_01_sfnt_off00010761.bin
2fdd82f60e783f6484cdd59528144581b04097739284824e1b21f266b5e2066f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 11104 bytes
font_02_sfnt_off00012d0a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 4324 bytes