Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ffcbecf6bdf31a…

MALICIOUS

PDF

94.3 KB Created: 2021-09-09 07:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df21a937b313b32ebf05075697b4feea SHA-1: 93ec349281f4100f31881e334cac988df6f6ae7a SHA-256: 44ffcbecf6bdf31aecc2a89c4b75f0afa66aee847f59cc843bdb1e9631d7ebf9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or distribution network. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317907a3de2---matexumudaxabomijo.pdf In PDF document text
    • https://lorus.rs/files/kebovaxu.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/63289705795.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/78808936404.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/1586420807.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/loladulizafigodazevitaf.pdfIn PDF document text
    • http://temple.mo/userfiles/file/49164745459.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/takevowalogoporaxudor.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/towera.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/popasuzuto.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/72433123288.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/filufupegupuvugasasetasep.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/22737261256.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/7923895042.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/19187733353.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/guvedomisulubapopakipinim.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/demezolefokovi.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/56641102455.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/vuziruzesa.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/redinijoxemuxetogike.pdfIn PDF document text
    • https://ultralloy.net/upload/files/12875564919.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/welizigakunawa.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/85383166501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pubg+download+1.0PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/kozorovuwuxixevakuga.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_off000110cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CB 10400 bytes
SHA-256: a2a29c49f52bb8cc50ee073f55a8f1f63f2f38715d87f915e363e118a22850b0
font_01_sfnt_off0001283f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 17092 bytes
SHA-256: 8b9229eab08be41a3ca0c3304b1a78581fcd80409540f3059bc057bee1fadaf8
font_02_sfnt_off0001541f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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