Malicious PDF — malware analysis report

Static analysis result for SHA-256 222e803d1e9f2386…

MALICIOUS

PDF

71.7 KB Created: 2021-09-18 06:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac469a1f95342e39084e20eb7ac15d62 SHA-1: 3eb771eda8132045292364fdb5d8bda3fa85f8a5 SHA-256: 222e803d1e9f23863d8af0f68564dafef1324602802cdec4b88370baf08e73a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to redirect users to external sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or scam lure, likely attempting to trick users into visiting these sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://nomylo.ru/uplcv?utm_term=how+to+view+private+instagram+profiles+without+following+no+survey+2021 PDF link annotation
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c694b4e1516e17888495a41356f0abc8/wolovanubu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/mijakofob.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/5999441029.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/41979619556.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/47443245254.pdfIn PDF document text
    • http://wjcopy.com/upload/files/lidejolofikedigonugefuz.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/23243013222.pdfIn PDF document text
    • http://wenxuezj.com/images/File/47971958065.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/9058944942.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/fujef.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/71341337633.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630782226.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/32320942677.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/87849956002.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/bifewadefigivol.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/fuputatumin.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/73522960268.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/63508873903.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfc7358e5---5407939280.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/samomul.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/64712500723.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/lanajox.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_off0000b35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35E 11456 bytes
SHA-256: 52c68116ed50e2e398c7b452d9d7e812567311260f9a45dd4b33d354bcd62111
font_01_sfnt_off0000ce64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 16452 bytes
SHA-256: 467665e9de3e5419d651a93b119d15f29b8e627afa49f285decd55c0f58a0608

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