Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0140c2cca481655…

MALICIOUS

PDF

83.4 KB Created: 2021-09-20 15:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85d05405fd91a9eb009a752b3ba01b76 SHA-1: 13e1a054a41d74837b3b8ab022b5834af2f2068d SHA-256: c0140c2cca481655c1788286f910e6de08bc3fd080e075a643235ef167ea89cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to PDF files on different domains, suggests a link farm or a distribution point for further malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it may be used to deliver or redirect to malicious payloads, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://winstar-tools.com/UserFiles/editor/file/xejikabajobu.pdf In PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/nodijiwi.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/96534981295.pdfIn PDF document text
    • http://taxfreepoint.com/file/dagojoxizexufi.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/51094406191.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/61894619717.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/11372712806.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/rokagofugowiluretezeper.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/nawuginizunazolemow.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/2215926162.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109022153173246.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/74622523459.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/vamimaz.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/97799458064.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/16834178886.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/89863577752.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143482c1f3de---92401762962.pdfIn PDF document text
    • http://aimic.com/userfiles/file/96249327658.pdfIn PDF document text
    • http://belniig.by/public/file/wefufuvobotewafitigana.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/madegisafemewewerasif.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/61893616333.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/87865262713.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/93267377437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adblock+web+chromePDF 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_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 10312 bytes
SHA-256: 392cb321e0a07d3a196313542c485d7f0fdcd827a33f604e316d211f3a893fb0
font_02_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 18016 bytes
SHA-256: 7f7901f0dcb4b09a8d15ca5e045619a4606062ffa925604c1b423525a2f6f72e

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