Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca43b186eac0757e…

MALICIOUS

PDF

68.2 KB Created: 2021-09-08 17:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f8dbcda1a55d7b7d8567489edaa2231 SHA-1: d50abda249c0a8fb56f84225655170ab6b4b5897 SHA-256: ca43b186eac0757e4a8f21dd6c42b27b4d77e051b10468948f1f040335b0205e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, specifically an image-only document designed to trick users into clicking an embedded link. The heuristic 'PDF_IMAGE_LURE' indicates a screenshot-like appearance with an action trigger. Multiple URLs were extracted, suggesting a link farm or redirection mechanism, with one URL pointing to a PDF hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://shesob.com/file/files/bojitewuzosinobimaneriw.pdf In PDF document text
    • http://ke-sen.com/userfiles/file/1631010639.pdfIn PDF document text
    • http://berbun.com/user_img/file/45078043303.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/51925702510.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/8867496159.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4821fc3d---26432901422.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zenoliketusutekizev.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210907_76C46D024BC1BD07.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/71512286879.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/tizesawuvipoletagor.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/81549189557.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/somupokezu.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/9400981608.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/dc3158b44ddb3a39fad7f9736d9b1776/18365753548.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-08/210908090810696387i79jnep9u4d1.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/judafem.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/2508091640.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/57734666427.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/kuwivezomod.pdfIn PDF document text
    • http://chinalabware.es/d/files/fanugipipikakanuwor.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/98048764818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=machinery+foundation+design+pdfPDF 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_off0000af59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF59 11060 bytes
SHA-256: a313884c5fdaedd5325422a6965e3bef9f3039faa6a971f0107692a37262267e
font_01_sfnt_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 13924 bytes
SHA-256: 8fcf1897a3ab5435cdcb5d29998fe23cee7c504f4105d83e6c537bf6e8c6507d
font_02_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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