Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc90f25cf07fe91a…

MALICIOUS

PDF

95.2 KB Created: 2021-09-09 03:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d6ac8c87486fb1c0c65aaf332f8085c6 SHA-1: 9c37d08da9ed4d3c7e97de563823c76508e8d60a SHA-256: dc90f25cf07fe91ae8938ed1b4e6372b17db8dfcf75c269256efd9f34d044a59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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 https://drafthe.ru/uplcv?utm_term=free+instagram+followers+generator+online PDF link annotation
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132faedcb550---rofaxuvip.pdfIn PDF document text
    • https://phukienbep.net/media/files/66920189892.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/nibewejepota.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/romevemebugudovilur.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/29608249808.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/18268270147.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/37476363522.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/37359602491.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/zepesapegibajonodi.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/kizeka.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/wegojoralezosatoditujuxe.pdfIn PDF document text
    • http://thaide.org/userfiles/file/44883572216.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/50392641435.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/kuwisozivari.pdfIn PDF document text
    • https://premiersuli.hu/files/files/suziwolomurufijisi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/zudefovag.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/sunowifiwakalazemokedisul.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/79389334890.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/57758687333.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/42969c549999f18f268b768df921c84f.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210906_FDEA2E28C82A09EB.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/dagufanawoxiwekapif.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/54324298272.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_off00010e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3C 10620 bytes
SHA-256: 35583f9f7ee68a69760ac8b30190bf9c5f57e168781aebe79077dc4b5811c06e
font_01_sfnt_off00012693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12693 18416 bytes
SHA-256: 2529effbf52493a634ee634b130255472aabe9837760676fcf417f39b3bcbbce
font_02_sfnt_off00015681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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