Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b37d4e9c757b15…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 13:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8b0b309e35b7c222f8d0f47bf709aa0 SHA-1: 2f2fbd62b1f27ef011470c14be7c71273b70507e SHA-256: a3b37d4e9c757b15391f295ad13370accacac3d7208533de6ea4cdc7d03b400e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=hill+climb+racing+2+mod+hack PDF link annotation
    • http://mathcountsoutreach.org/userfiles/file/netakoxawabagup.pdfIn PDF document text
    • http://sivam.pl/files/file/xudof.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/93084242583.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/gogisukiw.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/zizaduv.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/keveriwalefozukazugidatif.pdfIn PDF document text
    • https://value.ae/userfiles/file/305824925.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/walazewexedot.pdfIn PDF document text
    • https://dhesient.com/media/kumin.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/91803844754.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/26457694969.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/wimerasokivebikigixow.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/nurokovupobedekusisam.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/xuwoti.pdfIn PDF document text
    • https://seger.cz/userfiles/file/34511869468.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/38565256624.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/96299707048.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/gabijipevozeb.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/84311116461.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/tozojisuwuvarewixuwareb.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/851067150.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/5qk1hpbuk9o49uvs860sikjhru/67645332549.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/52494387900.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/fowujimexovufebufuxexo.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_off0000ba55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 10760 bytes
SHA-256: 9156b6e65f24ed172269d2f9bda96574eb572a6d39b6c048d2ef5a0a18789081
font_02_sfnt_off0000eaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA8 15528 bytes
SHA-256: d4b4e23818cf445ee9e7e033265709632f4f37e86586675cdd2f969c0057c578

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