Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c10f2cdad3c993d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 06:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d17072c064b3bcfbd0f142266420a1b8 SHA-1: ae4675ebb6390fe22ea4b7dead2b57a219e16f93 SHA-256: 7c10f2cdad3c993dd38790341b914b2494090bf6b46ebd01749401d43185189f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest a campaign focused on redirecting users to potentially malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://garglob.ru/uplcv?utm_term=the+hunger+games+1+streaming PDF link annotation
    • http://baldonimarcostudio.eu/userfiles/files/50368311881.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/398609505.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/rudevigafitaso.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/tuzadozigululewikimo.pdfIn PDF document text
    • http://dr-temt.ru/images/file/51629457761.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gitanoded.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/vovufojemozupa.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/10029020877.pdfIn PDF document text
    • https://cardolf.ro/files/xudimeralep.pdfIn PDF document text
    • http://52963566.com/upload/file/202109250607215898.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/vodek.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/kikupunulatumotukasisedib.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/kawovalu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/87528746528.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bulunirobewubazobeko.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/jolenujunijigagisek.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/nawamojukidewesuk.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/49583239375.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/pawusifaxukukexisufapabed.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/sisegitida.pdfIn PDF document text
    • https://vestol.bg/files/file/1422575458.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/69554094740.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/raxokapunilediwopopuw.pdfIn PDF document text
    • http://sdes.in/uploads/sepowedel.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/fawibuxazuxuvo.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_off0000b253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 10504 bytes
SHA-256: d802aeed98bc6046697d5ca25ac187880193ed50a593132448fd33922256019b
font_01_sfnt_off0000ca0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 16512 bytes
SHA-256: 4bbe15db82f83b9d0e02761ffc2acae71d14e5cfc72beaa379ca6d1099ad6e6c
font_02_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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