Malicious PDF — malware analysis report

Static analysis result for SHA-256 f661e55055b0874d…

MALICIOUS

PDF

71.8 KB Created: 2021-04-05 05:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c91408740fe77e9982085df02b77d2a SHA-1: ed3a8c7a8fdaa2047c06be7369d3702f75c7bd65 SHA-256: f661e55055b0874da7f131ebd8598b2d935b2f065807ad7629774abb93db3dae
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that redirects to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to the URL's query parameter, suggesting a phishing or social engineering lure.

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://nipisod.ru/123?utm_term=rowdy+anthem+song++mp4
    • https://cdn-cms.f-static.net/uploads/4451756/normal_6041d78a42673.pdf
    • https://cdn.sqhk.co/rigizisojix/bhdHZia/green_papaya_recipes.pdf
    • https://cdn.sqhk.co/fijufupuga/YicjhFc/battlefront_2_online_player_count_ps4.pdf
    • https://cdn.sqhk.co/zolulesar/bhajhig/pac_man_costume_homemade.pdf
    • https://cdn.sqhk.co/faxidopudome/43Zjdr1/fipenesavezi.pdf
    • https://static.s123-cdn-static.com/uploads/4491173/normal_6009a45e1f6f4.pdf
    • https://cdn.sqhk.co/sevimifogu/0hgEheT/chapter_58_coronal_polishing_short_answer.pdf
    • https://cdn-cms.f-static.net/uploads/4406466/normal_60625a5a0fba8.pdf
    • http://sewutaf.iblogger.org/kasizuturokuvalokejuluseb.pdf
    • https://cdn-cms.f-static.net/uploads/4413231/normal_605893c0813cf.pdf
    • https://cdn.sqhk.co/vinikawikuve/W3hwgjd/4180701184.pdf
    • https://cdn.sqhk.co/jetirivotu/cjfNSic/zixevejukipopurutiduve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sefiwegegagu/calendar_2019_india_word_format.pdf
    • https://s3.amazonaws.com/vavapekadoliti/dewalt_cordless_tools_replacement_batteries.pdf
    • https://uploads.strikinglycdn.com/files/fd55caf7-672b-4823-a7f1-0f69c800afd4/american_economic_history_rutgers.pdf
    • https://s3.amazonaws.com/gateme/baregomel.pdf
    • https://s3.amazonaws.com/fedojigudaj/basovoturupidelawawodokaw.pdf
    • https://s3.amazonaws.com/piwanisaj/91559765671.pdf
    • https://uploads.strikinglycdn.com/files/79f88a12-2c8b-46de-9a10-af590ba1b1e6/html_table_cellspacing_css.pdf
    • http://desabukil.epizy.com/pronouns_and_antecedents_worksheets.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_off0000d8a2.bin
62ee1f09b95c0a01015a5f9cf12eeac8c0b16683a53d6d51235e2fd3b4cbd136
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 5536 bytes
font_01_sfnt_off0000eb79.bin
5e2adc3eea11bcddb55fc36b4a6264db4bd1da9b4cba0b7be2f64433036d7d83
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 11360 bytes