Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba7695175dee467…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 20:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29196f7b0cbad0b6e96c2996aa1ab921 SHA-1: a2900efa9c4cdab97d1bf22473777092a834e045 SHA-256: 8ba7695175dee467de9092fd3c40871a0eb35ecf812ed18d30683e57d69ad2df
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs pointing to various domains, many of which are identified as disposable link farms. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high concentration of links on potentially untrusted hosting, suggesting a phishing or redirection scheme. The embedded JavaScript likely facilitates the execution of malicious actions or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d8043b20---85406377736.pdf In PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/22227458470.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/kafelomixupu.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/zifelivevibajojomu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/98261767972.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/gekadogexatalavop.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/pusuvu.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/desimewajusaz.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/47281958886.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/delimilogulowipu.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109090158548300.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/zulevupekujojaba.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bcbc099b2f131d3ff9b616e551c46e54/xusox.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-9/20210909005333287819.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/vadusewavibewekedenop.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/82659132888.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/zamevima.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/pikanej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=my+hero+academia+movie+release+date+2020PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/60309098569.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_off0000c37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37F 21992 bytes
SHA-256: 1620f6658d9d7cd4709d67ad32ed4fed51a876b9da3d01b789caccb607aa0b57
font_01_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 10944 bytes
SHA-256: 36fe890ece5d596d32b5f05d5693a1bcc296e245cec96582d2c4712ca7b27c9e

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