Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb28a7ecd6532c4d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 07:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a592b9c450d95fe002e338dee073b616 SHA-1: b8d7b075d1b577db0e59b3842d799d2ecdbc3a76 SHA-256: bb28a7ecd6532c4dd7a6b868aa688d03fbb127d3433a76619e0479286fa7512b
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 embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://aaronandanthony.com/userfiles/files/31162427295.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090413212781.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/41901038329.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/62289115548.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/71777517224.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/98835936788.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/339688604.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210908112202.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/gixamilotewatofawe.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bisulejinazil.pdfIn PDF document text
    • https://totounited.com/contents/files/5462651045.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133cfd72073f---fofaporesesekodegamaxo.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/56808072760.pdfIn PDF document text
    • http://ux-school.ru/files/files/lataxoxefosu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/101028451393.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/46061050367.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/zawaruwakizola.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/12687779998.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130912171278---22836674352.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/xavedudawupokuvijof.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/68029729219.pdfIn PDF document text
    • http://electric-kernbichler.at/21123156736.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907185648425820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=quadratic+parent+function+calculatorPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/nidesavolesarox.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10604 bytes
SHA-256: e4971b9b9d63243cb5c7a5188f9741312100fe14c40f4b23298ca95285030680
font_02_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 18088 bytes
SHA-256: bcf9d1a91dc60ec218efad559e6f2110e03976472242281c6c276525a8bfa89d

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