Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabfe03e74e42e59…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 13:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6806364ae7562405fe488b0cbf4061d SHA-1: 8af612717a9665efcb4052b62d00db5386f88c90 SHA-256: cabfe03e74e42e591e42be47a639b7113cfa111352b616d6173752a409859eb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded links suggest it is used as a lure to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=apollo+justice+android PDF link annotation
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/vujapezalegenimanor.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/libisewofuxagemonawogo.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/xudulofita.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/85446458571.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/13202899233.pdfIn PDF document text
    • http://cga82.com/admin/File/nakonamipegora.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/fewurisezuzalibomodulit.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/rufebuz.pdfIn PDF document text
    • https://cubic.is/userfiles/file/bopidofegebo.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/wogagun.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/68785fbe4d741f503054a875ea596d96/kiruwepowi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zeposorafavegofinosola.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/81424070810.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f805d54a---39915376175.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/detegutominexijufaza.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/12059034238.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/6703708160.pdfIn PDF document text
    • http://brukbet.com/user_images/file/14635776193.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/82138217764.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/76476280681.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/33014851647.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/fozalijiwofujajusipixo.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/komese.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/59865511087.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/totulojipetirowufoduz.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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 20520 bytes
SHA-256: 779d1f75a9ea82dbcc87978009df8cbc429fa9b9efc2a2ae7becad2864e075d9
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 10716 bytes
SHA-256: 3afbbded25cc3d92bb8d32688456c11d7e6b1002ef0063fece2d9d56e8af19ae

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