Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1434d2a2f0643f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-14 01:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ee9b9a7b6a840644534b4f9e32db072 SHA-1: 0c3c8d990764311d0f23625b87ed7a3d74eb6de9 SHA-256: 3a1434d2a2f0643f2935812aaf0b5b458ccc52484defa5ea22b239d43ee4546b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://fueandhair.com/userfiles/files/44615062353.pdf In PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210904_7865C5640ED21EC7.pdfIn PDF document text
    • https://hirurgija.me/files/vopevo.pdfIn PDF document text
    • https://hssanesteban.cl/files/natokizimabujusinegewok.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/xiniluwis.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/tafupowimorumesodiv.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/9376615848.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/48453788816.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/30606113184.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/35689864939.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/327551345.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/27d5208ca9a74810a1ad2aac33f758c9/70204500299.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/mafafal.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/debinik.pdfIn PDF document text
    • http://siroyensao.com/upload/files/97732836207.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134640ac3ea1---tojerarajuf.pdfIn PDF document text
    • https://adium.ru/userfiles/file/98543104950.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/75208063067.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/47338472187.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7435199470.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/28617111672.pdfIn PDF document text
    • http://hzqzg.com/d/files/2752650427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=intellectual+property+law+pdf+notesPDF 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 16644 bytes
SHA-256: d004207b13553467e472ea400a144a054b0b128583fadf40ee8eebd71dee0861
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C6 10772 bytes
SHA-256: b4dbbd71333b301f80faf073d47d20077df1998c0ad6308f33370f57ec898cca