Malicious PDF — malware analysis report

Static analysis result for SHA-256 d519eb45c0731d11…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cfa41f1e3bde497c23474eb1000b13bb SHA-1: 60c92050aef4ce06f39c93df3fe3a3ff3248d83f SHA-256: d519eb45c0731d117dad216a11108d190823b8458ea414eac78d994954cf241f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of many embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://thomas-zigon.de/images/file/40182768729.pdf In PDF document text
    • http://tdvvietnam.vn/webroot/img/files/mevemaxagapajekabinumev.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/zezakunuxilorixixi.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/bupekimejijinazikutu.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/34636103411.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/sajagojegitumixogokutu.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/botifosuzeg.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/54245955078.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/3007853488.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/44268054452.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/87510434317.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/xoweg.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/xawininobowabinesojepebow.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/13509707424.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/25243736944.pdfIn PDF document text
    • http://eecca.stocker-development.com/uploads/ckfinder/files/bewagokisizoxedozo.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/614eb3020746c.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/wukobavokoke.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/38069812868.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161459ae9ab517---72736292056.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379b1e5c3b3---lonewigezapilineleta.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/mutanuwabuzoremidawijuzut.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/tefulupojizoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+delete+pics+permanently+from+android+phonePDF 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_off0000ad8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 11076 bytes
SHA-256: c45c2f0cf42c77bd3fa81c2ca12ad0d753423eb421035a533fddedd6683676e0
font_02_sfnt_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 14564 bytes
SHA-256: ad8ebd37d6d7571ca115366e41f335d21ce8b9d4a574e82f2be6263645be5b80

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