Malicious PDF — malware analysis report

Static analysis result for SHA-256 9424cd1248241b03…

MALICIOUS

PDF

78.7 KB Created: 2021-09-23 22:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b60432b187a67657ab01bdbace8d3acb SHA-1: b7c11a76529b8170491e60cbf277e5d0d59f5fbf SHA-256: 9424cd1248241b03061e8391888dd0b7760f1b84f796e49f807e9776db39edba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of distinct hosts with few links per host, reinforcing the idea of a distributed lure or phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lrdreamteam.com/files/files/file/InfoProduct/file/natusafizipijilazog.pdf In PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/wozufipozamisijodizaw.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/nogafowubefazasuri.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/81527356061.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/nefisinadenoxujifiz.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/71458640723.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/23079735135.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/bewetevamekogubumotuzuz.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/timopemixexaxasuw.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/nofatasuk.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/riduxegemanuzofa.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210911_200440.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613be15c88587---70224330253.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/90541193736.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/buzigo.pdfIn PDF document text
    • https://clickbox.ro/images/file/31050577993.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/22534143262.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/zodumuzapozesutanarap.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/goziwadubilojozimu.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/bekasonewolimasemed.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/87188764085.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc1d7fcec---50067984244.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1632188855suzevosiwis.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/88567708525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rpg+with+romance+androidPDF link annotation
    • 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_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 17836 bytes
SHA-256: 2ae3ccc39fc8e273f0ae02e21c94fdb6983ecc4f90b980e916cf07fe0bbb42cc
font_01_sfnt_off0000fc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142D 10876 bytes
SHA-256: 4a9b8beae985dd1ce750d28e0d95d63a5ae44ce29fa6bd9bdb2e774c1fd7b56a

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