Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca6b9145c95623f…

MALICIOUS

PDF

81.8 KB Created: 2021-10-08 21:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6fb9c8298676711187064020aef731bc SHA-1: 1288bca13dc4f7660e952c809ba2c9dab8ccc40f SHA-256: bca6b9145c95623f93a894d5aa5f0e7a3db87ead1ecda7919ec939e92b156a11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the PDF's primary purpose is to redirect users through a series of links, likely to a phishing page or a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9c029cc1cb26e97d75c0c2385ae792a5/77259378653.pdf In PDF document text
    • https://psychologgia.pl/Upload/file/40018575529.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/gogakowi.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///54838127613.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/buvegerewimakomufufefireb.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/wirizededudugejotasaw.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/wujapiwezunomumegutemerub.pdfIn PDF document text
    • https://jensbrode.de/files/file/mewubor.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/60576591200.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/rugifupafikolamurikuk.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/15805476814.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/zowexuketatajedokalab.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/28885944350.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/ravemoro.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/posuzupitogosebexenizoj.pdfIn PDF document text
    • https://edusfera.pl/upload/file/kidofawi.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/86250136200.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615318fc27e8f---90490232192.pdfIn PDF document text
    • http://fittbikese.hu/files/file/95196467502.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/sekawofanapoxegipulogujun.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/28865681054.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/25386138323.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/zavuviwojip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+legends+unlimited+coins+and+diamondsPDF 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://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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 19912 bytes
SHA-256: 3df6589ac2de0d2f9b3bbcac87eb0ff4aeabc35998893d0ebd2090e9153ec708
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 10844 bytes
SHA-256: 627aebf72ef88b0eacb6105213da129a5c98cd32559c2c54bc0b684fe30056fb

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