Malicious PDF — malware analysis report

Static analysis result for SHA-256 49bec71ca4f6bf73…

MALICIOUS

PDF

83.1 KB Created: 2021-08-25 13:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4886e3e50075508c4df098d53950c321 SHA-1: b44621302847377891df49f15ae890cd982b4cbb SHA-256: 49bec71ca4f6bf73c57ac08eae0b39622df88ec697df4e45bb2c6584550b3bb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary purpose appears to be directing users to a network of other PDF files hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://akcjonariusz.com/UserFiles/file/3692585145.pdf In PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/kodiz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q70fkhmugggejv7rdk90r7hpf1/busaxekaginozibatakux.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/79799079360.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/bepibubataponoripexusekuz.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/17085849734.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/36329432911.pdfIn PDF document text
    • https://argumentua.com/i/file/22759178130.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/nemojin.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96537827530.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/95293267416.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1a62bff18---jobureximo.pdfIn PDF document text
    • http://master-br.ru/img/file/zafunasusumel.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/46143071192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=phineas+and+ferb+my+sweet+ridePDF 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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 17284 bytes
SHA-256: fd29a38b80b38d4ea5239b3eba8b5b10a907169afb461adf6e1cd6718b50da99
font_02_sfnt_off00012683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12683 10792 bytes
SHA-256: 519baa04dd873bf87a6fc6160a8fc8f4a7f98694166121095aac701e1d64d5fc

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