Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db23c8966c66fee…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 12:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ae5974915f07dafb141c74c268c5760 SHA-1: fd3c27165fb041d56ba0ab410b32c2fa718c55cb SHA-256: 2db23c8966c66fee208af55574f7181a3a00b14022bf78f5f4829636a639391b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains numerous external links to various domains, consistent with a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://soles2walk.com/data/file/23514827603.pdf In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/depubomuxijizevavutax.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/1431627342.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/33316990580.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/vaduwa.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141ff696f2f9---fesexonake.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/73667697232.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/mokebikukaw.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/96664769188.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/vogevajudoboraxipa.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/sasarasazonoxage.pdfIn PDF document text
    • http://checopharma.com/upload/files/sifoweloremadumedu.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/31396555303.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614146a2b242c---naturijirutazevurusifoloj.pdfIn PDF document text
    • http://pronobile.de/catalog/file/xoluvimepuwawevomode.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/97927514393.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/kiwimejevakipebudazup.pdfIn PDF document text
    • http://viorina-deko.com/images/file/73636273866.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/sememanu.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/kopekefezowupipufud.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/83978447295.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wuzuzigovikuvu.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/vagejomapixijevanarixilo.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210910120611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reduce+blue+light+androidPDF 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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 10764 bytes
SHA-256: f47493e574b05229a0044fb18cb0a63f58995edfddef66890040d4008bf1708d
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 17912 bytes
SHA-256: 00489c961034d45fa78570ad9883dd1939362c94ab08a380de7c63c110438d1b
font_02_sfnt_off00012acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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