Malicious PDF — malware analysis report

Static analysis result for SHA-256 c234c720f26d5e1f…

MALICIOUS

PDF

84.2 KB Created: 2021-10-04 13:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6dc227cab1f2acb71ac5bb38d75f7a4e SHA-1: a928579022ea8bfe809f498f29972ca7f69d14bb SHA-256: c234c720f26d5e1f33851697b1a391674f17d8512f1dc2c734d9bbb88de2232d
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. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used to distribute phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=best+ab+workout+for+love+handles PDF link annotation
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/10988656960.pdfIn PDF document text
    • https://esvigo.com/upload/files/11462907919.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/25830356758.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/pibipetesigivu.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/53753733777.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/24880759904.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1072d8e1e---10929843482.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/wumowap.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/19731804022.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/24894092999.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/pelexamigiborinofowik.pdfIn PDF document text
    • https://eurotig.ro/file/vofuzawilarivimeditif.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/54331693890.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/setoselilenezixupomixomu.pdfIn PDF document text
    • http://dakmet.pl/upload/wogozufimuviledep.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc6f7c567---82840115980.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/22459971117.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/28039890378.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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 10896 bytes
SHA-256: 18ee90881cc928e08cc57671856fb205d86f0c4fcd9fa6804c660f3b90736bb2
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 18664 bytes
SHA-256: 850583e239b682a2af67f1d7703c6db521fbf06f4e7d80fea3733a39213b8d06
font_02_sfnt_off00012b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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