Malicious PDF — malware analysis report

Static analysis result for SHA-256 5538ceb92a4dd41c…

MALICIOUS

PDF

85.6 KB Created: 2021-03-09 06:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 679b50eee3107dffd772ea7b24be2b1a SHA-1: f265e006e95da18d06dd4103200b77d140884a4a SHA-256: 5538ceb92a4dd41c82f427e9fcfeb89e721aa92719fc56ae9f0e37cea1e07542
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs, with one pointing to a suspicious domain 'druttle.ru' that appears to be part of a link farm designed to redirect users. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=behringer+x+touch+one+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383688/normal_604342d023aee.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/iiGJfid/wufatoxepulinejajofitefu.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/jjcr3jb/father_son_quotes_and_sayings.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460460/normal_5fc8fd0105f28.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/hjgaOgc/bloons_tower_defense_3_hacked_online_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472753/normal_5fde10daca4be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5fda444675280.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fenelepor.epizy.com/labelling_parts_of_a_volcano_worksheet.pdfIn PDF document text
    • http://lememisuxelivem.rf.gd/all_versions_bible_apk.pdfIn PDF document text
    • http://vopepogam.rf.gd/how_much_can_you_make_with_real_estate_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092d7db4-610d-4928-b904-e6961c878d35/kuzizazuraguf.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_504a53356c7e45f1a2fbc497fc4643cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/nepixelu.pdfIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_e3a10d7cc6bc4cc9999910738875c9d9.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_5d2988b21b3f428c84fbb693fbc26e31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/123fe604-d4ba-412c-8d3d-389970b1d3eb/tulimapivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eaa8f4c-247c-4e8a-9a6a-c61cea0a74f5/watch_me_before_you_full_movie_2016_online_free.pdfIn PDF document text
    • http://vitivewizonomaw.epizy.com/fugidopasinuzepokofike.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/california_mandated_reporting_age_chart_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/bhoot_bangla_hd_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 5392 bytes
SHA-256: 63acc899c7148e66cdee05de475b8d9f1805a0db2a9af2891380019791b713b2
font_01_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 10708 bytes
SHA-256: 247c2239bd500029a6a57f995167d195644adab4469ac3fc362e81881874c0b1
font_02_sfnt_off00013a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A81 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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