Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9650184e60fdb56…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 01:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e24379f5eb3c9cb7bde4d39bdfbe950b SHA-1: acb7f6d9e2c1bd9abc8c4cd91c4421eab05a0304 SHA-256: e9650184e60fdb5606a0a22328d14af16e63c5faad6186d16c5c5990a4b0de93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains. While no scripts were explicitly extracted, the PDF structure and its nature as a potential lure suggest it may contain embedded JavaScript or exploit code to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://onlinetalk.jp/app/webroot/img/fckfiles/file/71470530109.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/wigiguzowofugosefarurod.pdf
    • https://louvre.lv/res/wysiwyg/file/38752718686.pdf
    • https://dermatologie-francophone.com/userfiles/file/83892661506.pdf
    • https://albawadiroad.com/userfiles/files/96982322044.pdf
    • https://baglab.pl/galeria/file/74895373000.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161389aab43b84---58146959679.pdf
    • https://nyirfa.hu/uploads/files/mozokojalamimetasinigeke.pdf
    • https://dycmc.com/DATA/upload/files/202109281601599090.pdf
    • http://gramercygrand.ru/files/file/18563405375.pdf
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/fulapalejefad.pdf
    • https://footballsod.com/images/ck-uploads/files/jokajipuladuroburusemu.pdf
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/70535180276.pdf
    • https://esperanzadeavila.com/fotos/file/57955093211.pdf
    • https://matteagianotti.ch/userfiles/files/leduzolow.pdf
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/kojufifaxejenixazat.pdf
    • http://morakothotel.com/file_media/file_image/file/23594402670.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/22862805244.pdf
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/laxatezeruj.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe6be67682---56147113985.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/56894308936.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/febenumewo.pdf
    • http://heizler.hu/files/file/48401582475.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89aa50c34---vugesudobirifiva.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+tell+what+version+of+android+i+have
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b12e.bin
c8ef1d648f6365ce2a5401197cc5195afb945b5ec22031efd3b1e57437a3a47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB12E 16880 bytes
font_01_sfnt_off0000db8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
font_02_sfnt_off0000f3a1.bin
a69f51d1a1244690d1873edd9b60300c53d1cb05e94bc14a1edf4a0c72934506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10592 bytes

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