Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf1939becdfd130…

MALICIOUS

PDF

88.0 KB Created: 2021-09-14 02:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9446cac91fce9b8d9b597601465e5db8 SHA-1: 84f17e0c67bb86f39c85f01d90ce8107fe6b839c SHA-256: fcf1939becdfd13047c4bf0335f78c9ae4d0260c1f3755ee924a190448431fc5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution document. It contains a link farm with multiple unknown URLs, suggesting an attempt to host malicious content or redirect users. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in phishing and malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catherine-massage.com/ckfinder/userfiles/files/88077583311.pdf In PDF document text
    • https://siroyensao.com/upload/files/lavetufijiritol.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/50850371779.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/bubanaronuzuzesoped.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/vimuvewefagafe.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/jaxufujomavowubitube.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/2593466103.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/mavekemutudamuripixawa.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/15169206616.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/95371127032.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zevimososuxeju.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/70926761580.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/71127932570.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/migitelotakix.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/kowumadefageriwevaweturi.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/83301944049.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/79782776548.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/vafuniwunepusizesalober.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/xisodujunowonomulada.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/mufixevokujodonomok.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfea858727---fazobusiluvu.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/veruxudakixubekamu.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/87900314042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=assassin%27s+creed+3+apk+downloadPDF 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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 10776 bytes
SHA-256: 0aa8a1e7adcd00be68633f335957841c6ecbd832b65adae828f8eb1df7624d5d
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 19500 bytes
SHA-256: ce497402d7664a8b806c17ff3ba80d27971f329e388e43fd2f886dd30e788de2