Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c868bf487b47d3d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 20:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 04f3edc2334f868ddfadd149e3a0e4b1 SHA-1: 4050b28c31204a6e96bf0ff404c9a44a0504041e SHA-256: 5c868bf487b47d3d2096cae85c4122dda624283fe6a3f31a466dbdc75eec2d29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://yellowstonewildlife.com/4460715090.pdf In PDF document text
    • http://ydis.kr/userfiles/file/081436183496.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/zizosuroza.pdfIn PDF document text
    • https://simorgh.it/uploads/file/duwasuzi.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/37583717377.pdfIn PDF document text
    • http://specimport.by/files/files/fapijetuzuzuj.pdfIn PDF document text
    • http://mamitobe.ru/files/file/69324726370.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444578befe---71166474524.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/56472240143.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/jeturopewodazof.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/68321325614.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/xudemajesisepuvogab.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/sumub.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/93365446513.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/84705445599.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/julawijip.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/kebos.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/35206352811.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/runiletigotug.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/xavatamiza.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b114e1d1---diruwatiripemosowu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rirurobepalotugitin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=crash+bandicoot+collection+ps1+isoPDF 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_off0000b306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB306 16236 bytes
SHA-256: 10722b87db3155527983f9bc5cb455ddb884bfc2540888c66702c213b5e732cd
font_01_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 10836 bytes
SHA-256: 94d84574830863feb861f27c011e6ff133e798de4cbdd825edcbbc6214a27480

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