Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf55b145daf077c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 15:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 428b7b4652d082690b9089b0191209b0 SHA-1: e7ebc6e42571305fbd0bd438a832613fdb464f65 SHA-256: fdf55b145daf077c109074b970c8420c119ba24423c328812a82cf152862e78d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous URLs pointing to potentially malicious PDF files. While no scripts were directly extracted, the nature of the embedded links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traveletrust.com/basefile/traveletrustcom/files/bevonovoz.pdf In PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/xeziza.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e463a12cdca46670147c67143b448595/guxikulajoletekexodux.pdfIn PDF document text
    • http://01host.ru/userfiles/files/zituxobiwitug.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/gijasitor.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/pumodelepetodowodoxoxam.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/bujusoju.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/sejixefasi.pdfIn PDF document text
    • https://interconformity.ro/images/file/likukixikotinufejow.pdfIn PDF document text
    • https://tivicom.vn/upload/files/tojor.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/77361208313.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/94050841827.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/wubafusatituveguvime.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/lukorulizivule.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/doxojolojiwowevawiza.pdfIn PDF document text
    • https://ka-base.no/images_content/file/pokek.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/garorodiwutuliku.pdfIn PDF document text
    • http://travellerisland.com/files/kavugumesedojow.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/pesiperajoreruguda.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/mupozokomojila.pdfIn PDF document text
    • http://effektfilm.de/files/file/kurerareritugeluvekul.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nujirisukeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apk+downloader+for+blackberry+10PDF 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_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 21060 bytes
SHA-256: de19d3c66030ca9656c8c915258ec77e522c9199bbc789ebff534e528e723349
font_02_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 10840 bytes
SHA-256: 17bde1c2e911b03b503e7fb5482216da03c6e87c497881ed34fdd0bd932f2302

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