Malicious PDF — malware analysis report

Static analysis result for SHA-256 96541f9769ecfb91…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 19:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a47dc4daab77d3b4b87700d964b23026 SHA-1: ef09a599e5ebf83f3948783dc9667a1a3146f1a5 SHA-256: 96541f9769ecfb912161f8a3ba4681840a0b9cc2d0e0b58280e2fc14d4cddb8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=settings+download+apk PDF link annotation
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/fokepezup.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/gonixironin.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/xafitetunewizasowajiwonog.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/3539041506.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/35259932732.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/65dd8b171806b3f3031c58db4850514d/toribunetixakix.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/5652475212.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/51528777680.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/vunexomidoj.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/21404033634.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/piwemelokumeroketowesum.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021922253536824.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/lasajenikerisugifinenoxi.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/lomagonenogifes.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/11635938563.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/wewinu.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/43102523497.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388df76aa32---20881451379.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/84551301405.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/80502409267.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/4284534957.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/bugonenazosuz.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/5850070647.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_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 18092 bytes
SHA-256: d3cd5f058f1566bbaf34db35bb49ba23b324b1512298e159c1dab6be4a740233
font_01_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5D 10720 bytes
SHA-256: e9c3e50dc5fdceb23c0382b43cf13baf007de9817f0929dc489c0c31070995e9