Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f8748a43d80a5d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 00:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8f039dab27f0847364fdf89256163365 SHA-1: d0a6f24ad7a6fbb1a5a7ad1d09d986cbb3da0f5d SHA-256: 36f8748a43d80a5d8b1fb10f90d3902cd2c5e5f77925d0e44e06b32d84bbff69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 structured as a link farm, indicating a likely attempt to distribute malicious content or phish for information. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=how+to+start+writing+a+statement+of+purpose PDF link annotation
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/1004936722.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614927fe23316---bemipejatazir.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/jiwazaluwubuzume.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/maniban.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/54796533545.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/74981685708.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/16246636656.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/mabubobefekedaridamefuk.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35468915899.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/31479423619.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/migarizola.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/tupobem.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/mezopuroxilepumufulifi.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/xiburifomifek.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/tugawazirusanatubosorubo.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/63736998369.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/91504675549.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/91933186798.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zodejugesorebovololugo.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/58522567800.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/5634687169.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/44020499479.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/73158703539.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/5373489731.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/bejanixaz.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/nurogodupuj.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 14984 bytes
SHA-256: 4f7d7466941a538590ee5b9b63230d678c3576cd6212e8dd2d1c1c0a0cbc509d
font_01_sfnt_off0000d621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 10832 bytes
SHA-256: 2343c3abf2c18a58e943f934b2ea518e2d5187ef2ced4bd0560d1c380879a2b9