Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f072a3ee5cec8b4…

MALICIOUS

PDF

88.6 KB Created: 2021-09-08 14:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fbe7dad7b9b421b7af8f721e5fd0c91e SHA-1: fac95236d65eb84d403d97b67e297029729cb8f0 SHA-256: 0f072a3ee5cec8b4944418c2368fc4ccef3a2d8991c49409cdfcc66ee24eae7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to PDF files on disposable hosting. This suggests the document is designed to act as a link farm, likely to redirect users to malicious websites or download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb20eac6b---22247847458.pdf In PDF document text
    • http://bio-scan.com/userfiles/file/nujiwi.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/99080036887.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/geloreroxafezafa.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/34464397198.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/ruzupesujekilamutuzonow.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/nozetamumirupinobunu.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/safotef.pdfIn PDF document text
    • http://showdoimovel.com/files/files/raxumogotewowedakatax.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/83145168282.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/poludor.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/matavokutixigovafojibe.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/79201543298.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/44183054289.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/korexizasojonuvelaw.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/30575195435.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109011034208208.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/lunozutenunibi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gegefikufixarutomabas.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wazupuxuravudoratug.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qvco3ml1i8gj0d8pt1c61lfjb2/pibinixapetodem.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/51298122577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sennheiser+hdr+65+wireless+headphones+manualPDF 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_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 11120 bytes
SHA-256: 7eb451c83f827a85c43a7b23f35ad4efa80a0058c04a87ed1df73a9e8bbd7454
font_02_sfnt_off000123c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C8 19064 bytes
SHA-256: 7e7d48c91ea3a732bb33aec3b6d9d35c0da585886feb578c62036f356a8ab346

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