Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2bec58e0c4156d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 08:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 34951d23cfd1f22b92b8f306db336c67 SHA-1: 0fcb558b49c0f75751895d425283bfe22bc3bb7d SHA-256: 5f2bec58e0c4156d6cabfa44a3ac8e6930bf491788249bc1ab4bb682a96d5c75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicative of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=cradles+song+id PDF link annotation
    • http://cleanking.net/userData/board/file/93676384830.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xesajobirexebiwidumiwo.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/1575178731.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/97575427816.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/7733431106.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/93274815230.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/lolef.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/27468310593.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/kalopakoxeveguvafilunos.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/24472784218.pdfIn PDF document text
    • http://talesma.com/E/file/82995596314.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/walerafum.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/bbd401079b53f630c37a02007fe98d01/salowifugegututuwujes.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/wagiruduxagiziv.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/90241341676.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/gozek.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/rizug.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/fixalutipunexevagigafun.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/rugifugawakabefezid.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/zogivijozufoz.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/dosekavezanofuji.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufok.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/12892197286.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/madofijuga.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_off0000d7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BD 18960 bytes
SHA-256: b53c245f4f7c7d735d8173f8521f48d9f24cf8a47cea1ea829e17a739b97f11e
font_01_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 10356 bytes
SHA-256: 62e661a7f5182a27df1b580ad42465b2b9211f4c176bc94f62e78878457c6f86
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1