Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c00fb2c7041044…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 08:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47d0d6a3154cee042ebc26693cdcac60 SHA-1: 4a5c612e22ee579044f983e77014e5c9c4842c65 SHA-256: b6c00fb2c7041044412000368716c120abd55d6ad343e0a200cbb893b29145a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=android+phone+empty+recycle+bin PDF link annotation
    • http://owop.challengersports.com/ckfinder/userfiles/files/22962087980.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/bepapifezegasopololaj.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/87916738495.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/22583699631.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/34077350545.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/xupumovinuvodawox.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/93855733630.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/75219835379.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f55c0b48e2---55383006549.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/74314353817.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/70405767813.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/jafutikebuzelamu.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/wuzubi.pdfIn PDF document text
    • http://risme.vn/files/94415909406.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/29277071821.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/39826810447.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/3396332224.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/jigejuxa.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/mulofofufobo.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/24826511848.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/13598754944.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/jumoguwepired.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/28813555761.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/vivomajotaniguwa.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_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 16856 bytes
SHA-256: e5f74f7ab6e489922f740517dc74f167367d20dd14e68e75064ccbdf9c2eabc6
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 10684 bytes
SHA-256: 2ec3c95f7056d70c6ba3a8a39afe60986b8e55cdd74fb89a7300103b766d1e34
font_02_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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