Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a88df4902f8d73a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 08:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5da25e0d8083fe2cf8edb3a776676533 SHA-1: ab034ae460f4c26823486d041bb63c22caacd9fe SHA-256: 6a88df4902f8d73ac2dcfe3782e17e5ff1ffe3120ca9ae9b8ba44da287e7b490
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ledspectrumthai.com/ckfinder/userfiles/files/wakasamikizifupe.pdf In PDF document text
    • http://tuanayapim.com/rsm/files/30972301431.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/jegadawe.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29247974504.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/19530268013.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/dovetevipobi.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/vatirovusemusol.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f021a104e7---vumirineref.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/82740379344.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xesolidulefokexes.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mofulodisunonategunes.pdfIn PDF document text
    • http://splogservice.ru/content/file/60536894050.pdfIn PDF document text
    • http://xycrusher.com/d/files/26806578237.pdfIn PDF document text
    • http://preiss.at/upload_files/files/zevexemudikipuv.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/83004480246.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/11577539468.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/86535649523.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902095916.pdfIn PDF document text
    • http://186086.com/upload/files/94876232018.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b1fe55abb38b0d553d5d2cf54bec597f/97326454075.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/gawotaluda.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/gezexuwodubixosepun.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/74651786107.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/sakujox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=6+letter+word+starting+pPDF 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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10724 bytes
SHA-256: 4c05530c1bd2362cbbd32aa2a1ca72f21bde4a07ff9842e28a077d3af2e9eeaa
font_01_sfnt_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 17112 bytes
SHA-256: 3f2a1e78c2a8e9368ea183375ea07fb6712ec0e2060d8610712e7562271e6043
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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