Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b840c600245b977…

MALICIOUS

PDF

106.6 KB Created: 2021-09-15 10:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38217aaab81599480bb5732d91add3c5 SHA-1: 2a5c96c704209843e76d990725e22c5f89354e19 SHA-256: 3b840c600245b9774c58975a7e017a7619836e97cdcc54c8657ea03dd14c21a4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the presence of a URL containing 'download+data+obb+mobile+legend+terbaru+2021', indicate a lure to download potentially malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://inwebjor.ru/uplcv?utm_term=download+data+obb+mobile+legend+terbaru+2021 PDF link annotation
    • http://indemo.pl/Image/files/98271601362.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/rorovavoletajixufuzurujo.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/67548280233.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/3630703180.pdfIn PDF document text
    • https://migger.dk/userimages/file/dozaxawixurenoju.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/63905304062.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/613fcb0b065e0.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16881711437.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/gadamoxeb.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/26967008899.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/lenizalezebirepagezobet.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313c3fde718---47757883962.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91992373619.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/bonazawag.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/98380024153.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/niwozelusevizawewoguteve.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9aee152d---63324443085.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/tanogonejixa.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/tezakunaman.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161416616398d4---62096490199.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/29826790424.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/xuwuvikabonafasamevenirog.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/84588870616.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/xokodizonenadojowudojetu.pdfIn PDF document text
    • http://teplorium.su/useIn macro / runtime command snippet
    • 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_off0001372b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3D 19856 bytes
SHA-256: c7c836861eb5ce985753e7f73edaf2d0c6c62ce04fa7117332ec3057c586c90d
font_02_sfnt_off000182e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E0 11044 bytes
SHA-256: e878009ca99c56b774e5edc4d9d94354559d4e95b83a68e6beae38785aeaa424

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