Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6110053f01aa553…

MALICIOUS

PDF

113.9 KB Created: 2021-02-07 10:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 026a207c45f8f802ff217c79d8be7532 SHA-1: d5203d2f3b5885be40e43d27756e5aaaf0d6e1fe SHA-256: b6110053f01aa5538b8f12b8c8496591614a8a44c6c0bcdb7e8cc2c6e617fdbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to obscure the ultimate destination. Heuristics identify this as a potential phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent.

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://leonvi.ru/aws?utm_term=calibre+pdf+font+size PDF link annotation
    • http://fruittea.space/84055154334sjc87.pdfIn PDF document text
    • http://futegejetebe.22web.org/xejazunaxaloxanarazazemig.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/cab261df61.pdfIn PDF document text
    • http://loveantravel.xyz/720489529723idad.pdfIn PDF document text
    • http://mon-cmbretagne.best/presidentes_de_mexico_en_orden_cronologicosmbj5.pdfIn PDF document text
    • http://zelopaqq.xyz/zijagitawekozusamomutbyiy.pdfIn PDF document text
    • http://front-glass.website/poweziredomugebigobuyeff5.pdfIn PDF document text
    • https://nikigetevakawu.weebly.com/uploads/1/3/1/4/131413362/futojuviwin_zozomi.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/2245858.pdfIn PDF document text
    • https://degusatujetuz.weebly.com/uploads/1/3/0/8/130813325/dowutipexaz_melavuraderot_zevixelusowaji.pdfIn PDF document text
    • http://pevetune.66ghz.com/cbse_class_5_maths_decimals_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizimup.epizy.com/puwofaralolevun.pdfIn PDF document text
    • http://tapanowi.epizy.com/avatar_full_hd_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/bibepabugisigosomam.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/jesavobotunov.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/cheat_engine_6._5_1.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_off0001650d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650D 5140 bytes
SHA-256: 0c150902c946e9a5233f25024a2cd7570370c0db47fb572989b66444fa001259
font_01_sfnt_off000176f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F5 5132 bytes
SHA-256: 69f368b83a68ebd4eb951bbc5e7da450fb59e3d4952a4d9abfb5be7aeafbdd54
font_02_sfnt_off00018874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18874 15552 bytes
SHA-256: bec017904c7129cdc52b59af6bf549ee00f69aa99a2eacc429d8128ac603d270

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