Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae27694b4e2ec50…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 07:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e3d8f6b19e78817ecf78ce070085835f SHA-1: 836118319063a513b3c76989f31d5f5560df93c3 SHA-256: 9ae27694b4e2ec503ef04b118567047564a1d83759e6f68f8d3489a83f161cba
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing, as indicated by the PDF_IMAGE_LURE heuristic. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=emotional+personality+disorder PDF link annotation
    • http://platcometals.com/images/file/99738841294.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/38915982829.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/kinaporoxefajakikaxipij.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/71247293250.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/rejidejemejodora.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/81431291205.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e8ca2862f---pukilegerupujojodanugi.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/80088021447.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/dixirexenidor.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/61134373324.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/digozokomuxitedivarozum.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/42158059127.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/63389062481.pdfIn PDF document text
    • http://stl-hk.net/userfiles/37330781078.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/80869804797.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331fcbbe615---gasaxaxapavo.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/92319461825.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/zudemetitimofebanaz.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/divekakojitusofufi.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/zozepufedebitogewuga.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/31183745315.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/nanemelategelanapabax.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_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC777 14272 bytes
SHA-256: c08c4bedcfc32f7ddf3d785d5fd3df379482ff85290738323bc1c83ebc69de5f
font_02_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 10652 bytes
SHA-256: 0f70ce3f113eec251ed788d5a4adf869d3bb486769b59cc9f463747b3108ccf4