Malicious PDF — malware analysis report

Static analysis result for SHA-256 5614b579f4a25967…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 13:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04442f1ef287fc26e5ae73263847e26c SHA-1: 5b1de0b2a07004b0c7ba4746285fc682863b296b SHA-256: 5614b579f4a25967439d4b823912421faaf4fe76bafb373aecf00b689f25a3cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious PDF files, suggesting a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for links. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_141925.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8aeada10b8be34f1ee06893bdaf2e14e/sunugi.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/xapuwedosad.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210912111031.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/gudomemig.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109032223431602.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8db90493---renal.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/sikotowupumarojetopija.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/72503677937.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/90004669303.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/45278282150.pdfIn PDF document text
    • https://t2sc.me/userfiles/13631632584.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/75409309520.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/kixobisedenemogixaxe.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1e5acd955---87039916886.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/22681130272.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/zuvanadisijale.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/7223601594.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/73165748232.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/73723093390.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/lizeworitu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/jipegodifedeminati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=subway+surfer+cheatsPDF 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_off0000daab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAB 17568 bytes
SHA-256: 77da1883bd9923bf3e846b5c20cb1e4b92afbd6962d25f1870706bb2f534e197
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 10584 bytes
SHA-256: 0fe8098cc3a854850f4b5ee517dc266f83fa600ad973473a7b259d26254f7434
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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