Malicious PDF — malware analysis report

Static analysis result for SHA-256 508c5172662b40db…

MALICIOUS

PDF

81.3 KB Created: 2021-03-24 02:27:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0eec3064b10612999ef5ee4264e0a2c SHA-1: 276076de9a3891137a5d30be1e74a575368cdeee SHA-256: 508c5172662b40dbd5863c44ec7f6aa8cb83b571131b6c2f6390c541eef45be1
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'dafemum.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'Barcelona pavilion plan pdf'. No scripts were extracted, but the presence of external URIs and the ML classification strongly indicate malicious intent.

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://dafemum.ru/award?keyword=barcelona+pavilion+plan+pdf
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/42bc14c53f3201.pdf
    • https://static.s123-cdn-static.com/uploads/4379369/normal_60002f2eaecf7.pdf
    • http://kogejirupu.getenjoyment.net/aptitude_test_with_answer.pdf
    • http://worabipupe.mypressonline.com/basketball_court_layout.pdf
    • https://malalufapavi.weebly.com/uploads/1/3/4/4/134481779/5150814.pdf
    • https://cdn-cms.f-static.net/uploads/4457847/normal_6032364116851.pdf
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5ffc7e5773429.pdf
    • https://static.s123-cdn-static.com/uploads/4421630/normal_600306cfe8a32.pdf
    • https://cdn-cms.f-static.net/uploads/4449000/normal_600fdcd49b0ac.pdf
    • https://cdn-cms.f-static.net/uploads/4465543/normal_601165d622b65.pdf
    • https://nafizanoride.weebly.com/uploads/1/3/4/5/134596231/05221209c0f82e.pdf
    • http://silewugebed.scienceontheweb.net/skf_bearing_selection_guide.pdf
    • http://wolifote.getenjoyment.net/majavu.pdf
    • http://dufifudusimube.mygamesonline.org/how_do_you_forgive_someone_who_keeps_hurting_you.pdf
    • http://jarowulizose.sportsontheweb.net/59820785697.pdf
    • https://cdn-cms.f-static.net/uploads/4410416/normal_60554cf0a90d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lojabupabavize.onlinewebshop.net/compact_showtime_rotisserie_and_bbq_oven_accessories.pdf
    • http://zatuvejamubolo.atwebpages.com/mw3_cheats_xbox_one.pdf
    • http://pojozija.onlinewebshop.net/6-6_skills_practice_trapezoids_and_kites_answers_with_work.pdf
    • http://gakajitaju.atwebpages.com/positive_buck_boost_converter.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffad.bin
1c67c99e7824f46195e4dca51edc68e3e83e7faca8fc8eb3a8e26aa87a28e845
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAD 5080 bytes
font_01_sfnt_off00011111.bin
167b6fa7c3301ba06ad19635234ac9b4609283c9a9eb19036f3c42c0a4934ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 11256 bytes