Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa4b355878e4abe…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 14:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 475a0bd006551d3ec469aee746b830ed SHA-1: c5416fbf84ab483cda2e26440c3b461693f417d2 SHA-256: 3aa4b355878e4abe0ae8666de83f4558d33d336e385e89c43bc23d3fde1d9f46
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 pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=fastest+car+in+gangstar+vegas PDF link annotation
    • https://groupunsur1.com/contents/files/1329238675.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/21066281716.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/putanajosonewi.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/6213763434.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/tejarixudiwerabumixenavu.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/36486168285.pdfIn PDF document text
    • http://popmetre.com/news/files/41577993760.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613417bb425b9---matopodubukagulepuga.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/sumijimovibunubadaguzonek.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/nesisaxim.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/kaxelifesogupogipemos.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/xotiwabopuw.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/xesufodi.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/183403_61218627579.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/taponutepaworuzivir.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/58418375328.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/2655532709.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/49499325174.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/judimitikavaborigetejuwa.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tinedo.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/27766110388.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 17544 bytes
SHA-256: 270141c37862c324ed9b2d122aacefd07eb268100f973c12be0b76de763061cf
font_01_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBC 10280 bytes
SHA-256: 82c83f0aa535f49690d2197388cdd051607ae6a6b65b30989824fd141f82b868

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