Malicious PDF — malware analysis report

Static analysis result for SHA-256 4266c27a6f58dd10…

MALICIOUS

PDF

69.8 KB Created: 2021-10-01 00:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97d6bae30b02821c8129e5ee2edcf0dc SHA-1: 77675da532ccb5c15a6cba044cb4a152fa92625b SHA-256: 4266c27a6f58dd10901aded85dae064e12c02e29c64c424befbdb772d6b8ee35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and numerous external links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=age+calculator+android+studio PDF link annotation
    • http://zenpersonnel.com/UserFiles/file/jazezisaduliwezodajomaduv.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/mokuki.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21100511024.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/93761065485.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/komozujinutejej.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/db8d731561daebb8cea11946255c01bf/rimideda.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/riwedanitez.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d965069ff5---bafilofufuruf.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/16058574003.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/43425142258.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9588d742b---zeroxasabilibumegovu.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/10689787838.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191101124656.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/bifekizawo.pdfIn PDF document text
    • https://ismart99.net/upload/files/kofegupudig.pdfIn PDF document text
    • http://favourtec.com/attachment/file/8533797804.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/vufivesux.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/xoputuxipen.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/pegoxinisarelotatus.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/gilakaseb.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/jalisi.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/96689414057.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/59913617943.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_off0000b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 10628 bytes
SHA-256: b56ba09339c6bb902d55fb95bdb1fc6f8cd6ae71fef8b932eb5ab13ae4a65e93
font_01_sfnt_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 15624 bytes
SHA-256: bef5a095980189533028008406597ea6e5ef3914357fae6b0557d7653cebef4a
font_02_sfnt_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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