Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b93dd16a8fedffa…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 14:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60c509c73cb7a779c51d14dc1af2ec75 SHA-1: 96147538b0c139734e7958f61fd0496553c288cc SHA-256: 6b93dd16a8fedffab3b5fba0c2143a5865d3fcf9aa23c114844506c030e72608
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://synfarm.com/upload/files/vomureketipadijavexe.pdf In PDF document text
    • http://1-sanya.com/blog_images/blog_/file/dorukipivulolo.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/jijojumomufe.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/65353165763.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135f558ddef8---fezezasokexoneb.pdfIn PDF document text
    • http://baove247.org/upload/files/zijezinuwa.pdfIn PDF document text
    • http://orthodoxnews.us/file/dabilizugizilefifunovufi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/riluzigizavesovofozovozer.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/85279881997.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/lewepozitanusizadir.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/xibafof.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/siginaviberemup.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/tomotilemedemavamalor.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210909231815.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/78932059221.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/rokixovixog.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/50cf471254808156d3c6fd396c45a2bf/wugokexafeb.pdfIn PDF document text
    • http://bienbao.org/uploads/files/kenirisanujijuvefaburen.pdfIn PDF document text
    • https://cooperspick.com/files/juguman.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/26704557614.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/fofajamewesux.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/35499965727.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/39812125449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+change+hostsPDF link annotation
    • 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_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 18856 bytes
SHA-256: af6fe676abc59491063d947fa8d3078cf952a68767b004e744382c5ade900a0f
font_02_sfnt_off0001131e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131E 10584 bytes
SHA-256: 2b678af0289c8414b31debae2cca0b462900ecbdcc66bb35ca8b363bec678758

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