Malicious PDF — malware analysis report

Static analysis result for SHA-256 d274f9b1169964d7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-21 01:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e33970b04500f15cbfdd56c8f4323351 SHA-1: ad4440ec8ff217c895da6079d85875b111d5be7c SHA-256: d274f9b1169964d72da8cb8aa5c084232b4d83b98406c75156f40a2b1d0a9ca7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to trick users into installing a browser extension or update. The embedded URLs likely lead to malicious payloads or phishing sites, suggesting an attempt to execute further malicious code or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pistant.ru/uplcv?utm_term=dialog+mega+run+mod+apk+unlimited+data PDF link annotation
    • https://mldom.xyz/web/img/podborky/files/15230248694.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/97719769796.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/ziwefujuveduz.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/zemotivozom.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/54849727388.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911224574506.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/duwexanifotubugomag.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/73312355255.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/33863281620.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/nobazidozuzofuzejadiwe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614674593de3f---tosuwabimekubogopiza.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/sofinagudap.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/metibodabuw.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/kologedilekufufixopera.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/7581039750.pdfIn PDF document text
    • https://togeltop.com/contents/files/3713378272.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/faforaniwife.pdfIn PDF document text
    • http://anpharma.net/upload/files/30897550074.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/87434568685.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/40612671941.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/16213527741.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/sejod.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_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 20120 bytes
SHA-256: 3179fcdf0cf50ffdc1403e221f761dfa8e80510a2099d696d1e8e792507d0c17
font_01_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 10760 bytes
SHA-256: b7572633eb8801350d0750c1ca82cb3b3d8f5e39bb6c08ef1e9d3e0572052c7b
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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