Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d735e4c594ee6c…

MALICIOUS

PDF

91.7 KB Created: 2021-09-19 02:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4cbaeedd74ed2f9a80e518267426143 SHA-1: f6231596d5ac266aa293ce16445fe2daf9485cb6 SHA-256: c2d735e4c594ee6c27384428db9092641d803ca46a14b1e6b967c3dca31c17b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ramenzoni.eu/userfiles/files/xagupuwalimobuvapaboxelo.pdf In PDF document text
    • http://sun-eko.eu/files/file/97294215651.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/55159213705.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/8006662041.pdfIn PDF document text
    • https://zzhqhi.com/d/files/15360555968.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/mowivuxiwajif.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/23917624896.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210913233742.pdfIn PDF document text
    • https://digicpictures.com/downloads/74452795263.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/maporoto.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5a535c01---dipebigixixerenoxusekoji.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/buxazizu.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/70269695584.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/novoporiti.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/vigirukuse.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/lazusefaper.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/dagonujedokuraraxeso.pdfIn PDF document text
    • https://ratodua.com/contents/files/94682388466.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/36796771207.pdfIn PDF document text
    • http://chinalabware.net/d/files/fufin.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/74302576715.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4106c420102e1bffbfbc1c0fdfd060b2/28068311979.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109100607029532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=carx+drift+racing+on+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 10580 bytes
SHA-256: 30557108dafce68ba76e0f94caabe1f550c8326419ae500186c61b3f83c07718
font_01_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 22692 bytes
SHA-256: fde3e7ccc3057b92050c4415cadf128eb8a0362f94ca3c0364b11883e537fb4c
font_02_sfnt_off00013374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13374 16152 bytes
SHA-256: 0f62411f33c11177563efe33ebd0105f37df2a55e6a92cd5aec3f2cc21bf3838
font_03_sfnt_off00014907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1