Malicious PDF — malware analysis report

Static analysis result for SHA-256 216a090a41ef7823…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 09:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f01b43600da1a722fdf189d03cadf8e4 SHA-1: 63f99d41df95ef315cd46046cc2a7abf177e1e05 SHA-256: 216a090a41ef7823e1178c6c39de6e8d10008eae154329a8ca18718daf1d1e30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a tactic to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://poganyvolgyi.hu/userfiles/file/jebulevamiruku.pdf In PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/83910466638.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/12421065758.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/duvevativuwikemiwopimoxef.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/wipexajugegu.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://imobilestore.de/userfiles/file/70780762327.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/sugetefarul.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/89881448cb541a8babdcb8444247ba60/54775485172.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/87340474481.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/8729464645.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/sajojorokosoluposopeneto.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b311e977c17509cdd6e6103298acbe75/27945421797.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/76369157044.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/kimorenovasojeliwera.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/13639621034.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/2639258904.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/77592174307.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/mujoxezokutelagovawovose.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/poluxufa.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/80064917010.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/xagezid.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091001070897.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/rewulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+getinsta+apkPDF 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_off0000d35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35B 10648 bytes
SHA-256: 6567fab0c1f705781beabeb7ce009f6d070b13eac8674f5bb4609df05262db4c
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 17976 bytes
SHA-256: 06331cff314e686ac798027d07b20e038dc1a4ae65ac4d54b9fa6c33c0c408d3
font_02_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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