Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f22615cea7f35e…

MALICIOUS

PDF

130.8 KB Created: 2021-09-13 22:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: e37315ec808fb66adf0dd826c3b11284 SHA-1: 0ad6c5b50bf6709e02e1744e6acbad73c0280805 SHA-256: 71f22615cea7f35efd2e4ee980b998de2edfaecb7cc7091d68a1c5b3276fea62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://albertf.madteam.net/ckfinder/userfiles/files/radaxa.pdf In PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/56581158704.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/56505767813.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/83484661968.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/vasudafaledofarelokoduge.pdfIn PDF document text
    • http://upakuika.com/img/file/74283422495.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/luweg.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/17089407690.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/13104270332.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/besajaf.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/1057525351.pdfIn PDF document text
    • http://gerocuki.hu/user/file/59400059549.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/50918075533.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/50421979793.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/xowoguxupunib.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/10391023076.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/79364090568.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/ralijosopuwevazelesep.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nekuxawasosul.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/4391321480.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/95371209397.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/73842858176.pdfIn PDF document text
    • https://alutat.com/data/file/68891261605.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/30368551155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=les+miserables+pdf+englishPDF 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_off00019791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19791 10824 bytes
SHA-256: 2e86cb3d7de62d3a7b6db94323537bc32d9c53d81956305b7faff80e9c55d82f
font_01_sfnt_off0001afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7DC 20984 bytes
SHA-256: 672197bfb99a30d85d179fa3a228f6e5e7c53c1f351cbfa7391d8a0655b99371

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