Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d5c2bdff02bea5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-21 15:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e73125557228cd3acc866b5dc7984146 SHA-1: 96bba3a14394822588890f6287fe9c0e2aae7ce7 SHA-256: a6d5c2bdff02bea5db62978084c350e10127d07fa4ac6313a08d6132858ba006
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to distribute malicious content or phish for information. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=roblox+mod+apk+robux+download PDF link annotation
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nemasunovagidalawepuneten.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/supifikedixefatar.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/512546801.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/suvajalozibujike.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67302616983.pdfIn PDF document text
    • http://enkepharma.com/upload/files/52920593574.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/xarejinogur.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/taxulotugavuginudugev.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/5503951732.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/75818018315.pdfIn PDF document text
    • https://paradigma.bg/uf/file/91569874506.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/vubudexuzatupamavi.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fenabadowoxegabiza.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/vumokopuzag.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0da69260228b6b590a8921d48cbc9c5/50982813545.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/225229177.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/91907531897.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/valaka.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f58ec1c5---riwonozokokexuj.pdfIn PDF document text
    • http://gnox.vn/upload/files/zumopemobisawavaza.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/wavirifumireruzikes.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/21552250813.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/polimirin.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_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 10628 bytes
SHA-256: 3c32e67e673a47edcc2e4067c0f51209688c9e3d7a1d9260a59cdb18a8f06fde
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 17792 bytes
SHA-256: f104d0b9f8a7449902fd9a4e34fe41499dcc70ed91da5e17077265d68b56b545

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