Malicious PDF — malware analysis report

Static analysis result for SHA-256 8276f2f04b3c1148…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 08:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5377770bbaa0e618d5ec22fbed727da2 SHA-1: 0ebf61a76164786cc33ad2664dfa6b4354ac82a8 SHA-256: 8276f2f04b3c1148f04a018a72ac1ac1b0b92d02b6e909c50448455b16dd53d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=ff+apk+download+2021 PDF link annotation
    • http://hani-bee.com/userfiles/files/19535330076.pdfIn PDF document text
    • https://guijek.com/userfiles/file/rasuzik.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/31091129659.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/2201823200.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/wuwojewu.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/bajugonosamavadanurof.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/33927748052.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/36614790823.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/tomaravarotes.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/60472102877.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/87929767972.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71273167075.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/182152042433.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae5acbffe---fumiwuji.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/sawivinokowup.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/58031936409.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/kimesirizifofuzawime.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fmbb2jmo5j7ev2gefsq5nlv4co/81826598624.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/sajafusanimup.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/81130283886.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/73985398213.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/37351193891.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/zemoxisu.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_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 10348 bytes
SHA-256: 4e2420143781dc88cd2faefd4348c29302cc6a93aac318b7efc013f5c59cbf0a
font_01_sfnt_off0000cb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB13 15008 bytes
SHA-256: a81c23c1008de322856d02b4f47d0e6b33574a8de5b885d6d2439cb94bf82fb4
font_02_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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