Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4bef77e10cc272…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 03:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f0aabbfa7e6e6499d16798e8f3dab54 SHA-1: 2bc8f5f5336c5c861288eb02bd5f0b0126b9c63a SHA-256: fc4bef77e10cc272578694215139f0a8b35577074d3ff1b51e38809b6839da9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://mikomisushiwc.com/uploads/files/zipujij.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/tanuj.pdf
    • https://valeaflorilor.ro/img/uploads/file/zigezun.pdf
    • https://whitepalacegrill.com/userfiles/nulilebukuzujut.pdf
    • https://gancza-yacht.pl/userfiles/file/14731830865.pdf
    • http://rosniyom.com/userfiles/files/17356963833.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d46cc8cdc---xidokibavedu.pdf
    • http://gadkowski.pl/repository/filemanager/file/78225322981.pdf
    • http://schokozentrale.de/idata/7283429017.pdf
    • http://classicalgardenornaments.com/uplds/file/13681074476.pdf
    • http://wieswioska.pl/userfiles/file/95633891156.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/rorixorebezexezidejaveked.pdf
    • https://fasleh.net/Files/files/nevazufovototesokisukozi.pdf
    • http://rbmtechnik.pl/userfiles/file/35669207810.pdf
    • https://ph2020.org/FCKeditor/file/54895982824.pdf
    • http://pass38.com/images/contentimages/files/kuboxebetamemotujed.pdf
    • http://105chers.netsociality.com/upload/files/gekajukapi.pdf
    • http://splhardware.com/UploadFile/file/2021091115095973499.pdf
    • http://emachn.com/data/attachment/file/xuwut.pdf
    • https://lanjutpt1.com/contents/files/85466175768.pdf
    • https://ecpa.fr/uploaded/file/rezuvejosejozalugu.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/duduxatujijet.pdf
    • http://thessalonikiflights.com/files/files/luzefajosigowifuxizod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=imvu+mobile+app+for+android
    • 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_off0000b1d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 16792 bytes
font_01_sfnt_off0000c9e5.bin
a3e4aaff6c35d018f5163db443a76d0f1ba4d20fe53222800504731854ed66b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 16824 bytes
font_02_sfnt_off0000f4db.bin
2ff63883730269a360d6fdcd4612e6621c9837826bfc5626da63262cdc86f4fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10648 bytes

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