Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25df7518d64977b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 20:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 614b2deedaf87754b0e7d33dfe4b3d85 SHA-1: 4ddfdac356042d384e49396aaaa2cfac7f6db173 SHA-256: c25df7518d64977bcb1647bb4e2585e1347990babccb23325e37e3a94ddcc65b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external PDFs, many of which are hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://akcjonariusz.com/UserFiles/file/pokew.pdf In PDF document text
    • http://ks4073.com/file_media/file_image/file/midebigojumedefeduxaf.pdfIn PDF document text
    • http://doanhnhangiaophanvinh.com/images/files/24348894851.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109220428049478.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/radikukexijosorokol.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/50465807436.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/34019924724.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/98667862996.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/32737946290.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/joralumojikivatozalu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9379a3271---48468004763.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/fivopugujisutip.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/suxagol.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/nuniwab.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/natatiwiparigovapekilab.pdfIn PDF document text
    • http://exim5.hu/_user/file/texekagit.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/7389970208.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nalitijofekutitokawef.pdfIn PDF document text
    • https://kratky.eu/files/file/tadari.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/razokuwibuxuj.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/zuwirenixunewiwu.pdfIn PDF document text
    • http://my-glc.com/uploads/file/fafexenogebiluzabepagu.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/bobemamofedipapidukewad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+files+from+android+to+pcPDF 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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 11040 bytes
SHA-256: 702083feef22e853e04bcb6fcc65e2cbdd1ceb4d285b46fd298c2a3d845ed83c
font_02_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 17760 bytes
SHA-256: ad2c3aa617cf12ad3114bbe960bb8e144217eb30de76cbfd4c9f81b7df68b4de

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