Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a4a6c03f341a46…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 09:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f67207d20c3cb932efd6e742db57e72 SHA-1: 62188b7b8ae77957799f0db41a3468d526078f30 SHA-256: b3a4a6c03f341a461b1de3ab8d58a4f3d5ee14f89876ed8b16a1e822a7de8c3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=chapter+14+summary+the+giver PDF link annotation
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edecf8d1f9---99566311693.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/83357914161.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/gavisifatonupuvurepe.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/zifafinobuvob.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/34603146209.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rizamapafomakuzipis.pdfIn PDF document text
    • https://birotex.rs/images/files/mulekofopefat.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/75207230404.pdfIn PDF document text
    • https://techlan.pl/files/file/27818639083.pdfIn PDF document text
    • http://mamitobe.ru/files/file/zomusemafomarewamaj.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/dijoboxelubunifo.pdfIn PDF document text
    • https://sainaudit.mn/File/lefubipiwefogaxobuluxe.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/mabupajupumimedufegovan.pdfIn PDF document text
    • http://citranco.com/users/files/55226612456.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/650735969.pdfIn PDF document text
    • http://only-svet.ru/upload/files/55748671132.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/4851726955.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d611826ce3---66482744565.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109120652358553.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/64076022191.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/rojevajo.pdfIn PDF document text
    • https://khanikango.in/file/78436795883.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/8838866867.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/razomepike.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_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 10872 bytes
SHA-256: 0ab227db1dff76911745a6ac6fa33e2318d3ab5f8c243d6a738ab92607fd73b6
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 17208 bytes
SHA-256: 1404ea33d91073885f20e0fe539f4887ca391e4f663531d1aab09a951bf1ceca
font_02_sfnt_off00011956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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