Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce39c90ec0c3beb…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 10:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aa723b00c57a81104f3b69e12782f10 SHA-1: fadeda5c896c0ad548b1569d5390e94b24901514 SHA-256: 5ce39c90ec0c3beb79335f0347b987862ccd4926f940aa04e01625c53740f5e4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. Heuristics indicate this is a phishing or malicious PDF, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.ctnphrae.com/ckfinder/userfiles/files/79163345208.pdf In PDF document text
    • http://nceed.kr/pds/userfiles/files/sozavafunibi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/fodofijegonadugizusineki.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/13492779082.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kagewujuragudetizomamos.pdfIn PDF document text
    • http://trubaopt.ru/content/file/tekokalujelemirowumunidij.pdfIn PDF document text
    • http://devison-matras.com/upload/file/xinobusoti.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/13569899824.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mavemolezaburorozeroko.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613965885d5eb---64441441692.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306bb503147---46637527262.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/82817319204.pdfIn PDF document text
    • https://jetaime-shop.com/files/35951262200.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/46546092730.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gulufunop.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/69905204751.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/34190788059.pdfIn PDF document text
    • http://chamdure.com/DATA/files/titiditiwobidereso.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/lojupefiwovob.pdfIn PDF document text
    • https://terracell.pt/images/file/14524187158.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/zovupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=friday+night+funkin+mod+download+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/83668518227.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_off0000c8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B3 11016 bytes
SHA-256: 43360aedf2d68b80d89549a19856842a35c6a6d75cd98cf989acbaef51f41cef
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 18744 bytes
SHA-256: 8db07a5b1ab50cf5f0d777ec24d92fbadd9df194e67308a52cb94d889b8d3b2e
font_02_sfnt_off000112aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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