Malicious PDF — malware analysis report

Static analysis result for SHA-256 e842164869dd0c25…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 18:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba7b9816485e1588faa9d9a8f6b7fc97 SHA-1: f8c564d6f369b6b760f25e0ca39859b0ebd3588f SHA-256: e842164869dd0c25a28bf7c2e382f92ae50da21b1b1d46ca8a4bd16055804004
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed a link farm structure with numerous embedded URLs, suggesting a phishing or malware distribution attempt. The presence of multiple unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://szallas-karpatalja.hu/upload/vutowoxowegefidute.pdf In PDF document text
    • http://longtra.vn/userfiles/file/zafivomesuzo.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/98114550215.pdfIn PDF document text
    • http://newshop.jp/archive/file/xesobize.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/61961724903.pdfIn PDF document text
    • http://orderkai.com/uploads/files/poxifo.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_F033BA6593C9E065.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210910174853.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/peradirupuwewexo.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/33228881519.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/bonomekunokokazomu.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/86169570789.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/54659980490.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010d58fb7b---85848752117.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vewazezobabulajutog.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb936e390---28711153559.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/60325936815.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/kekowuxi.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/diguniwasuzarezemarev.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/77650133635.pdfIn PDF document text
    • http://miwon.vn/app/webroot/uploads/files/54929750822.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/33715453425.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zarokewapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+vice+city+mod+android+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 16116 bytes
SHA-256: 82caac0f157f375435d3e19b60f11152d855b04f252f5a663059f895e140f13a
font_02_sfnt_off0000f92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92B 10668 bytes
SHA-256: 7e7f4edbbe32d85422adf94907c3b435c4175f3973c60c7af76dca4acc5424f5

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