Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6570654aeef0772…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 22:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc66cabae214ad9958c1c165d5905c14 SHA-1: 847a8f715a46feeaab3dc3e35ad7cc8707a19bf4 SHA-256: e6570654aeef0772f810fb1287eb6e517a0e4af9c95ebe33fc3730193aa84b93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many on disposable hosting, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

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://catamma.ru/uplcv?utm_term=wii+u+shooting+games+with+gun PDF link annotation
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/98073095697.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613056589659b---50102077709.pdfIn PDF document text
    • http://ucokampen.com/media/files/rominuzezimobilenu.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/vivewatowuruled.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/4621620394.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/zekefizegelovatakip.pdfIn PDF document text
    • http://ombs.ru/uploads/files/xolobiwiloxijibiwugan.pdfIn PDF document text
    • https://limsurdua.com/contents/files/14845470366.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/16766835425.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/bowigapidumelu.pdfIn PDF document text
    • https://datajournonepal.org/files/22816742295.pdfIn PDF document text
    • https://mimpishio.com/contents/files/liwaduras.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/fazepinajakup.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/fesipovavu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/95852163632.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/37097683779.pdfIn PDF document text
    • https://robertbah.si/files/file/51197433125.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/4984861364.pdfIn PDF document text
    • http://www.77ice.com/upload/files/76604625533.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/47661196911.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/21307448842.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/96120661799.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_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 10588 bytes
SHA-256: 8abfe1ef5ce8833299c76368322c886cda9c6fc74a310ce3df3f84f08bbd328c
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 17868 bytes
SHA-256: 701cc804c6e6d47d1379b0d77d030d5e3b5e407e9b19a787dfcf62217db4dc07

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