Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00dca95cf9d81e7…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 01:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c34438bfd5bd5889e899fd7eb05f89a4 SHA-1: 0d94b153dd782729ec4f404d0d97b95c7d8dd379 SHA-256: b00dca95cf9d81e75364fb1f530ffcddf403bd6b307ad3debfc893648a3604fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many of which point to disposable or potentially malicious domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, indicating the PDF is designed to host many links on various domains. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/najijobobojilijejokeb.pdf In PDF document text
    • http://mstreatmentadvances.com/userfiles/files/fazakapevuxeworeva.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/60467270412.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/13270941461.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/jefenumir.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/26538557813.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0338fdcd---venija.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136182673915---gobedemufateselavaxenuj.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/gimirigakusix.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/fevovewopupirepu.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/99953698858.pdfIn PDF document text
    • http://seamacros.com/upload/file/jilasapadopovalolovexizi.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/vunoriwu.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/nutezilit.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/50163019084.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vogezibag.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/99465990158.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/80271835972.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/kimupobefo.pdfIn PDF document text
    • http://yibetter.com/data/files/keduvofexejiziwunisipa.pdfIn PDF document text
    • http://premo.at/userfiles/file/lugujunoz.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/38067686894.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/zidudasopojukofakefo.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/zopokixedujumupinawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gw16+smart+watch+app+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_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 20204 bytes
SHA-256: c9adcfc93d289f80349dfe39580a05d55e86901c76a4b25de49c51369434ac5d
font_02_sfnt_off00011e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E08 10900 bytes
SHA-256: 63b7eb90a4b69dbef8a53f52e2b08cd141f44644aa56a69944ca01a93e350efe