Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef92df25b0f7ff11…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 05:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b5e376a4c4aeadff3a29ca546eac0de SHA-1: 0d93be4be655c180e9f4f77f7000154ec21f473d SHA-256: ef92df25b0f7ff116163606481aac6f9997ea4367aa56963175a20be65b85428
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which point to disposable domains and are likely used to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 http://foto-preiss.at/upload_files/files/zuxesezuvakagovetovi.pdf In PDF document text
    • http://gazetavk.ru/img/file/rabejipigatifep.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/55827282104.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5c0b132cd---jubufotisojobu.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/77439433846.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/5827773961.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/xekexadopila.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/14840108794.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/9361590734.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/99002426898.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/35872619581.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907052513019062yy4xla.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/nuvunolulokefarakeboko.pdfIn PDF document text
    • http://smartcrm.cloud/upload/files/48985053838.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/tekuso.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/fepigikemevinakotij.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/dojiven.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/28272576393.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/ganufewapoturugisifazoxe.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/baberutudamobabo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614473d3753ef---56961737446.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/43868247172.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lofotezuzepozowazutanakuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chemistry+ia+database+examplesPDF 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_off0000db7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 18588 bytes
SHA-256: 15d5c39ca1c8622285d54110b6602d0d0674b0ccce8ec3c35a92e38d6bc431a2
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 10820 bytes
SHA-256: f902cbd010124e7e1b397b759cdf35c0d6fd837f81acaab5d99dc06e66432b86

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