Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3996c9cf127aa01…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 13:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7041e71ba40f4db5aa89b01237c37c5d SHA-1: ba49d3d44c9128832ec158a5bc8ac83ed59d27e9 SHA-256: a3996c9cf127aa0103e40d9b6a0c5ff3ec3b9b842cc6ddca0648a4d7765c4d0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy of using numerous small PDFs on disposable hosting to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://archism.ru/uplcv?utm_term=how+to+recover+data+from+phone+internal+memory PDF link annotation
    • https://e-uchebnici.com/img/file/kopowu.pdfIn PDF document text
    • http://idroter.org/userfiles/files/fuxifemopedimebam.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/gigadatavawitojoko.pdfIn PDF document text
    • https://fishuntpesca.it/file/83135267901.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/xeripi.pdfIn PDF document text
    • http://newshop.jp/archive/file/77248605825.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/zemuzizanogegogos.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/38240354188.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161429a7e2707a---38071246843.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/surexawudirukonumasov.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/64379817645.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/piwas.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/batiwaf.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210904052433.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffcda3460---26051284852.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/1511679120.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/gaxanapaxakapokew.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210918181229.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109082147239381.pdfIn PDF document text
    • http://riviera.az/userfiles/file/69457082353.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/6943092823.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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 19248 bytes
SHA-256: 0b1b8ae14b249df7df5566fa9e03be1449ad5d46eefaab3dc66dade7b0e57f42
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 10976 bytes
SHA-256: 0e4e7cb5c8ad10efe92d57aa99d3939b2bd5b73737a1974a930f6bfc16514cf2

Open this report in the interactive analyzer, or submit your own file for analysis.