Malicious PDF — malware analysis report

Static analysis result for SHA-256 685de4f0fae83c53…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 02:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c56672fd01eed5072b60262d07acc8f9 SHA-1: 204287edb39589cdfd161956661e4d9bfa87c78b SHA-256: 685de4f0fae83c535e3676b0a246516e7ae628cb45f5503870c89c467f1d84b7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting it aims to trick users into downloading further malware. The presence of many distinct, disposable hosts for links further supports a phishing or scamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=cookie+run+kingdom+hack+apk PDF link annotation
    • https://togeltop.net/contents/files/sesefepofagup.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/97448064558.pdfIn PDF document text
    • http://recrute.fr/files/files/26375004364.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/kosegatewazarokawagek.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/64073006289.pdfIn PDF document text
    • https://mfdesign.hu/files/file/39047449012.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/36293797308.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/02d3b0d91aae477f5506cc10cfc799fe.pdfIn PDF document text
    • http://edituj.cz/res/file/95656120357.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/lonis.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/pesujawowefigak.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427950a05b6---ratetifewiwifaz.pdfIn PDF document text
    • https://amgaa.org/temp/files/vaxukokexidi.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/pivisez.pdfIn PDF document text
    • https://nomortiga.com/contents/files/61718500062.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/rilokikiruzezupoleluf.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/34931833503.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/kofamomazuwo.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/danuzusat.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/jozarexigaruli.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/nivusugigeliworowi.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/17818521302.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/37688169989.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://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_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 20120 bytes
SHA-256: da2b9fb3bb5622aa9c944bdd6b81d059db3617240a5d27244c3f061f10b96ce0
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 10872 bytes
SHA-256: 96f4511443b91d4f9c4e189aef782c9675e1d61db2740f72fc03e7bcb7abaf50

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