Malicious PDF — malware analysis report

Static analysis result for SHA-256 d671b48afdb0e612…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 07:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21e1f508d3392bc6c8e4d6ff49ae4459 SHA-1: 31c92db2feb799af4734765f5f958d405b7a7a3a SHA-256: d671b48afdb0e612e54da5bbb3882779da6b7b6db7b65aaef54b8866b39410b7
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 external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and external links suggest it is designed to facilitate the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crysiq.ru/uplcv?utm_term=balamban+zip+code PDF link annotation
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b849418c9f260e1d5038369ae1c40d09/26135956007.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/jisawobupuvafivuzedosuza.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/kasosixiv.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/57777744747.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30077190705.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/vedenevaduz.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/fopamuj.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/27261007034.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/26825162252.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109071237185419.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/47064275042.pdfIn PDF document text
    • http://email-database.info/userfiles/file/xopovosakokuge.pdfIn PDF document text
    • https://hobbypet.cz/files/file/jaxepogativezakewudokufo.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/2831943486.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/resosasizigaxuledani.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ditufutipanesadepisupula.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/wutasewularir.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/waraxozume.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/zuzulisomozojemipatowet.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81434373855.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/givogavizowa.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/39912315164.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/92809161476.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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 17980 bytes
SHA-256: b84dda6c1481825d5b5765be1b71802b51b46ebfa88b7c8ac523ea610e5668f8
font_01_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10560 bytes
SHA-256: b86af673fa16fcd4e1e41960816dfd23cca95115427bbbe06c036998ec9854ca
font_02_sfnt_off00012367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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