Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf2d64a52b8e221…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 22:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31a98733949ee1e4519a70e8bf0bd7dc SHA-1: aa19c50c9ac836d67abf4e2d8c57a59b199b1146 SHA-256: 0cf2d64a52b8e22184af7e244c1fc5cd8a9a9f18b65893d05b5860727ce2aa63
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains. The presence of numerous embedded URLs, many pointing to disposable or suspicious domains, supports the conclusion that this PDF is part of a campaign to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ipayon.com/root/FCKeditor/file/44832746843.pdf In PDF document text
    • http://15881588.com/ckupload/files/84939819202.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/dugoz.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/927a3b2426fdbacbdacf70068acac455/xiwiranalinarugeku.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/dasofesejizagaw.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/filunododazilufapovokul.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/55753250610.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/bapopinuxumarixa.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/xigovoxojasowibowuvebez.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907030250.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210905182223.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/62769235261.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/44204134175.pdfIn PDF document text
    • http://temple.mo/userfiles/file/lomojejegulekas.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/68580100454.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/jizidel.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/tigususarigameliva.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/5178056463.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/28210159868.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/xogunun.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/milipakememekenivatonesam.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/29181393623.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/13559523986.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8aa5810e7---36628778478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=radiating+nerve+pain+in+armPDF 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_off0000d135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 10512 bytes
SHA-256: 323d61d1815a62fe3e722c017bf96e2b5d6801b14471077530eb319a3cedc2e1
font_02_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 16428 bytes
SHA-256: 500b5f150d8b264a7a091f438ad269aeb130227209c0b317501e5861dd3584f8

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