Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfa234c2e13d920…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 17:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b48acb636a2e3594c1b7ae16fd6de48 SHA-1: 28d2b63e21e4e1e9b3d1134279aeb41af0b587b4 SHA-256: 1bfa234c2e13d920908d3b2a37e357331ddb0f1854da2526ff99a064209f495b
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF phishing trojan by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The PDF's structure and the high number of distinct external links indicate a deliberate attempt to obfuscate the true malicious intent.

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 http://forepic.com/_UploadFile/Images/file/jiwipovilipajasobetakume.pdf
    • https://rpdev.org/ckfinder/userfiles/files/39697407835.pdf
    • http://elmbbq.com/uploads/files/botuwupaxeki.pdf
    • https://www.informacion-indoorclub.com/boletines/img/file/97675334727.pdf
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/92570624387.pdf
    • http://matsusushionline.com/uploads/files/sozidenovil.pdf
    • http://farmina.ru/uploads/files/79333755919.pdf
    • https://dukra.sk/editor_uploads/files/67467448098.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161343ac0c7ff2---jivupezorijoworifazu.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/belulap.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/915e37d88a097feeab0e5936d76b3a64/fewolojopomosa.pdf
    • http://www.hgekc.com/media/userfiles/file/10838931079.pdf
    • https://client-sms.com/ckfinder/userfiles/files/dogorigonipuj.pdf
    • http://seanmore.com/userData/board/file/99663015839.pdf
    • http://righetti-ticozzi.it/userfiles/files/87821906860.pdf
    • http://cmtl.in/uploads/userfiles/file/file/dumekajetuvanos.pdf
    • https://norservis.info/files/files/26631660735.pdf
    • http://geometramaurotozzi.it/userfiles/files/32727262824.pdf
    • http://daltan.hu/userfiles/file/65819160456.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/bizutusisideti.pdf
    • https://hanyauntuktesting.com/contents/files/14456376592.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tech+18+gaming+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02f.bin
9cd2f45c557b7471a1b9e07532cb4bafa202664b21ef5631033e97644b472040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 10864 bytes
font_01_sfnt_off0000e8f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 16792 bytes
font_02_sfnt_off00010109.bin
0137d019f2d289b9cacd92b82b7a0446cbed44f0b1c1de45ed2883389f4ce2a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 18384 bytes

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