Malicious PDF — malware analysis report

Static analysis result for SHA-256 849eb19de1674b2d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 15:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 375fe39b6275c9546edb2c53cf808bdb SHA-1: 972bebfa82fe0f2ae5e44451ad89901d26353470 SHA-256: 849eb19de1674b2d75ea9411fd4cb0f177f02524fa69b4e59d2e4e772be55259
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=wrong+turn+5+full+movie+123movies PDF link annotation
    • http://puzynowska-kancelaria.com/userfiles/file/43618493189.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/mekufoselajemo.pdfIn PDF document text
    • https://5uempat.com/contents/files/kurujipawevaxinovolasopif.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d5d010a758f7530ef35cc21f774deb96/vopagor.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/85411598980.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/ledarifod.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/17960060616.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/84153066434.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/91302541911.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/31396923181.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/28162777976.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/5908858883.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/wabewasebe.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b6938686---50743995052.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/21290720485.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/mutediweme.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/magijirolejibixej.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/kokajujapezefarowukexokov.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/28962206062.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210920092527.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_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 17316 bytes
SHA-256: e17c00bee8db586546fbf8e16fc2087e76433caedf1bff38cb6185c5cd36ac9f
font_02_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 11032 bytes
SHA-256: 5e4183ccce7a1021a961f1e97f327876f5b53dde83c442db385d722e7d2f40d2

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