Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bc6333f59ac190…

MALICIOUS

PDF

83.9 KB Created: 2021-09-12 02:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c09c9d4f1f544e8a47e1e4d29ffecdd SHA-1: f2954cd6688e7b0b60a739a9e0c2d5481f0f4f93 SHA-256: d6bc6333f59ac1905ce10b47661b114c52a0fd9aaeb2cdfd567a97db1f484797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. Although no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary function is to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fivetc.net/uploads/files/mukubupegap.pdf In PDF document text
    • http://novafish.it/userfiles/files/244583487.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/fozizetu.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/20016794679.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/manuzubuzalugewewubi.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/jajirizureruf.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/zidegefonukobamubetife.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/14833397975.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/pigepakifovitogixasogi.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/70962134518.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/mogugisasasamuxudox.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gamuwepafuluzebeda.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/nelewumofe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a929c0e95---majexugurovujasi.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-06-23-38-48-95.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210911_4196A89BD2F184E1.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/76932708159.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/mezukakegetirunuf.pdfIn PDF document text
    • http://agilesolutions.in/uploads/kafekoloxopitiworujated.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/vugevi.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/nifofaf.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/gogabok.pdfIn PDF document text
    • http://lex.tj/img/file/bevulogolibu.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/buzixixade.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/67884568757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=run+android+studio+onlinePDF 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_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 10388 bytes
SHA-256: 71a7c5172c152e4fd835add6751290cf486329140ee047a9d2180d53fb5a7d6f
font_02_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 17132 bytes
SHA-256: 828b65beca71657be1da9bf4725a272e82afcf6556f44ba2b4b67b31b8215752

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