Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac349ad9cd3eee7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-24 01:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1ee2e441d0882a5654829eeeee00fd7 SHA-1: 9968aa2611691dc6a7905602efaa171c6d6c77a1 SHA-256: cac349ad9cd3eee79e9d27bf31018199b2ff51eab8653760df3ddd484aea11e3
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 a large number of embedded URLs, many pointing to disposable hosting or link farms, indicating a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to manipulate search engine results or direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=dancer+sergei+polunin+documentary+watch+online+free PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1d4dae38c---40597131069.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905135004763264.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/jogumepukapumid.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/zuxut.pdfIn PDF document text
    • http://wohingltd.com/userfiles/tazadegarafod.pdfIn PDF document text
    • https://comfort8889.com/upload/files/divorirudewotufuv.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/379891930.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/77313789849.pdfIn PDF document text
    • http://ge-mak.com/files/lutujukowosipizagedununo.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/lujikuvejeditob.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e876bbfc5---fuvumivoselozufu.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/vizaxitazagof.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/muwikiwisorexazagu.pdfIn PDF document text
    • http://dnepropress.net/files/file/58347999484.pdfIn PDF document text
    • http://metabolit.ru/files/file/xakiverujabiwateb.pdfIn PDF document text
    • http://sergeybazarov.ru/file/25499257845.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210914093244_z4bt6s.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/lanudukomoworageno.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/sezapikosukobuwomatakusi.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/nanuwivuso.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/rofafuwepogijat.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/61247497610.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/gafofisivufifonak.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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 18360 bytes
SHA-256: a3bf20ad7e6506c39eab28ee201604287e614297ad27b2cf04301224d5963592
font_02_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 11368 bytes
SHA-256: 14d100543f81f893e86fd838b4a4444257f1096106cafc341e7a977613295b41

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