Malicious PDF — malware analysis report

Static analysis result for SHA-256 a106235f93741a71…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 16:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 67bf8eb6b4539f71885ce1e5af60946e SHA-1: a466c81211d721cc1ba1b0aba4cf8cfd60ca913b SHA-256: a106235f93741a71cbff3c594d8a9fab0a3f5b4907252c5cc7c3dcac62b0fd1e
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The presence of a visual download button and the ML classifier's high confidence score further support a malicious intent, likely to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://biomax.shop/filespath/files/20210907095651.pdf In PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021932230118635.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/93363608452.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631209644f3Te.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/sisoresageninesasa.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/1290790033.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dijoruvanomarevew.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8957271095335748dfe2976eb21e564c/kibuwa.pdfIn PDF document text
    • http://deforma.it/userfiles/files/77127944646.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/rekurivifasa.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/50010926427.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/74800991271.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135298cb559e---vowufobetazobijuduba.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/33470125811.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/18257488362.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/33103710910.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/86271095987.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/71761901224.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/37039451400.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/xiwuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=igi+1+download+apkPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/duxaxufiwinejizatitonagam.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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 10252 bytes
SHA-256: fa1d0e7d54e85a444375fb3e82f99339765a3f12ee6107f16f82db950648cb80
font_01_sfnt_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 18992 bytes
SHA-256: 23535f1cc20bd6e229a9ab3d16b9920d9b3205f99012ddc4092a9fe4dfaea22d

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