Malicious PDF — malware analysis report

Static analysis result for SHA-256 5998ed403e1b3f0b…

MALICIOUS

PDF

71.9 KB Created: 2021-04-18 11:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f1957ca6b314b817a9168caa0e13ee33 SHA-1: 2398a166ec9cdf1d701ad2a00f123eb3dd37dd66 SHA-256: 5998ed403e1b3f0bf1b3a9516466002349630b5e062715b484f72126df13e0b6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to game boosters, aligning with common lures for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/strik?utm_term=can+you+have+negative+z+scores PDF link annotation
    • https://cdn.sqhk.co/welosezu/jfgjeeb/game_booster_mod_apk.pdfIn PDF document text
    • https://rebavunegiluzu.weebly.com/uploads/1/3/4/4/134497465/2d17ed325bfbca.pdfIn PDF document text
    • https://fubapisa.weebly.com/uploads/1/3/1/4/131406294/rovifedube_kofudum_mitapulidutivi.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/jiGBgji/death_point_mod_apk_data.pdfIn PDF document text
    • https://cdn.sqhk.co/zijopenuxafi/DGAhgh0/infamous_machine_game_download.pdfIn PDF document text
    • http://zijixiteluwek.scienceontheweb.net/xuxevokada.pdfIn PDF document text
    • https://dumerozum.weebly.com/uploads/1/3/4/6/134611270/e134dcf9.pdfIn PDF document text
    • http://vokegitejupud.iblogger.org/google_books_online_tool.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/norozovijalu/79799147016.pdfIn PDF document text
    • http://wupidusujimi.myartsonline.com/tb_drugs_side_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/55846524589.pdfIn PDF document text
    • http://gagodat.rf.gd/test_de_raven_interpretacion.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/81684332676.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/85661253326.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/24354194635.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_adb95fdab30142ef8285420f08fbfdb4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/roxawo/83258936843.pdfIn PDF document text
    • http://waminakukivexo.rf.gd/zikogikev.pdfIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_df4ca50240f44a85a3d06fbbf64d6111.pdf?index=trueIn 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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 5148 bytes
SHA-256: cb9a4ffadd3828a2ba921c3c918128a671d8c7f15d082d59718a91c862c7450a
font_01_sfnt_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 10752 bytes
SHA-256: f337d6844df5a32e0fc5715f84c70e1ffb9dcdb6af63e3c05535c447d352ebeb

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