Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c5e406395180a0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 21:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20d037e90a9bc52a3b594ea8119e8540 SHA-1: b18d3a8681bca7ba86d503d2c67902c518304aa5 SHA-256: 10c5e406395180a0f2ab276bb39363da6b71e62d9eace5c923577ae81f30dd5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to distribute links across disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=itunes+app+for+android+tv PDF link annotation
    • http://mevlanaasm.com/resimler/files/fiwiteratafikuzev.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f471edff4---20777027794.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/mopijulevubapove.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2972cefcba156f883582fcea5e8b816/3148754771.pdfIn PDF document text
    • http://dakov.hu/_user/file/zejenowusatamagabosuvuxap.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/duxulivagusiwukuke.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210902113312.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/wejogiduwaxomox.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/64458939914.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/pabavejibokujabum.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/52909400350.pdfIn PDF document text
    • http://trieuduong.com/images/Download/kivasugizedesugonulatupiw.pdfIn PDF document text
    • http://ceroki.com/image/files/paxogatewifu.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/59824815136.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/94083323927.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/72797671371.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/49621517714.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/94824655465.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/novik.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/pefufifipuselabudox.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/47707634442.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23216258506.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/18054941683.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_off0000c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 16900 bytes
SHA-256: 52d40bfda02a117b686e209e237690b5262ee27f7a2e2d49c684dc37fb9591e5
font_01_sfnt_off0000ecbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBC 10564 bytes
SHA-256: 7fb077300e0c89ea44d9ceb481494abc8476bb511116330a5279d5be0f26c3fa
font_02_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1