Malicious PDF — malware analysis report

Static analysis result for SHA-256 16923e8fadbd778e…

MALICIOUS

PDF

83.3 KB Created: 2021-10-15 11:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f9ad299273e20961782a20c47a94e45 SHA-1: 4e05cc358e189cc03eed9e7b2ed0a94f43e8a1ee SHA-256: 16923e8fadbd778e7f5b58e52c57044f7ba9136d757b09ca254affdc2b4a97be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm for SEO manipulation or to host further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this malicious intent. While no scripts were explicitly extracted, the nature of PDF malware often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://manegedebuitenwijck.nl/uploads/file/66181122601.pdf In PDF document text
    • https://birutelorasin.com/contents/files/13734311284.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/33341876207.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/75007184314.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/92222595609.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/pepiwujup.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/pezukowapimajevipasojit.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/ravegomijaju.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/bujipoke.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/28852837936.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/26382243418.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/mizaverelagagisadugabi.pdfIn PDF document text
    • http://cudicio.it/images/file/79633358403.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/74522509862.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/likegipusovipofevaxe.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/wupatonosalir.pdfIn PDF document text
    • http://ergakiland.ru/files/files/tagipefavizaduz.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/vazatoj.pdfIn PDF document text
    • http://mylodge-naoshima.com/miwaxofener.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/71048967621.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/88865303895.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/siwogobire.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/24271815500.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/5bhJmFgkeCE/uplcv?utm_term=tupperware+pasta+cooker+instructionsPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/sefiwuguzawi.pdfIn PDF document text
    • 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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10564 bytes
SHA-256: 68b4ddb4a764b2aa2a8ce84877d042291d5c079c9dbbbeccce2d45b3b8a22ad1
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 18136 bytes
SHA-256: d45ae0e2524436e87bd81860ed3084d1448b6ee458db4489e3785e961121163a

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