Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6d9d6881efe6b8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 11:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e2f66e7c26a009d401962162b2a9e9e SHA-1: f950060db0c48e2a26dcaf128f87c0393666aa7e SHA-256: ea6d9d6881efe6b895a8efdba6ed0606ba3820190a8203446b22909706b419e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=call+recorder+pro+apk+mod PDF link annotation
    • http://bigdoughpizza.com/uploads/files/sakezatozomapawuzipen.pdfIn PDF document text
    • http://jonme.net/ckupload/files/namugatuvifumojatakepesif.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/rumifokomebomuso.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/nuxusamavuwuzu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/21775821186.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/75836088864.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/90171810652.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/tutinuzozowubitagapiwit.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/vutuzenolozuwawewuxoxanej.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f2dfd7644---75116379360.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/5686856221.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/68444368091.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/lunefubugigodu.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/xadapan.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910125656.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/pijugene.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/87863153334.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/kawagusuxijitubalibatag.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/73303595426.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/57599152741.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/xamomoviporigeruroligonip.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/48882816639.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/xixodizatojira.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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 17692 bytes
SHA-256: cfa61e2629db608fbcdca92f56f1e93272b98d4cf7ec5a6e6259d256d9a637b1
font_01_sfnt_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 10336 bytes
SHA-256: 210b74db65af010d3c2368aa8a5f8a733315b1840d57032bf20de4f17a6e6ccb
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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