Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f08aa619807f3bb…

MALICIOUS

PDF

86.2 KB Created: 2021-09-08 20:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d49ab2a7e4479f89b74b142e97a3cced SHA-1: 5ca6b941702e74ffc66f5d28301d1f6b22cff4ec SHA-256: 8f08aa619807f3bbf0f3025ddc5a4856db4c30caf0b71d116ad1602da7ab9af1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF structure and the presence of JavaScript point towards an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=best+pdf+editor+linux+free PDF link annotation
    • http://thucphamchucnangmy.vn/uploads/files/nasubanaselanusosovukur.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090412053886877.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/47427594753.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d054a27f2e8d5fd5b83fa93a1318ad7f/5789270650.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zebolufofud.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/66773354776.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/xasamijawipano.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/vonugekegufu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/9677803747.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/gewapobevefe.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/zibenamijubulebejevivagaj.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/50463925518.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xewumivowekeranupedotab.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161344f2231432---48816704834.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/pimowavazilow.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/xefejubixumilinewuzatajux.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/rasabakukurokuda.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/91736831528.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/29848785233.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/88371538158.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/5677435077.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_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A0 17772 bytes
SHA-256: 30358df4913e35115d9aecca324310e04282a4d85e929a056a08a5fc335cad7f
font_02_sfnt_off0001339d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339D 10584 bytes
SHA-256: de818a73c01c20f2cf8d520fda29a16286a05fa61fb63ac0b47e3468de2e4bcc

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