Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c403936221e5daa…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 06:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4395d24fe60e28eea8ebf96247289f25 SHA-1: d68375f29359542014eefc84017a13856ace2fad SHA-256: 9c403936221e5daae3c1af46fbfbd233b953ec93f59e0ab36a7173afeedc3cbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests it's part of a link farm designed to redirect users. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://oniceh.ru/uplcv?utm_term=how+to+disable+third+party+apps
    • http://zonazero.es/userfiles/file/92907063060.pdf
    • http://alvitraders.com/files/jozukitoxejegutiw.pdf
    • http://files.ibiza-ferien.de/file/50138104953.pdf
    • http://epmachine.ru/d/files/99658310154.pdf
    • http://jfe.hk/userfiles/33462920076.pdf
    • http://slavutich-media.ru/userfiles/file/80548713804.pdf
    • https://apagar.cinemadossertoes.com/ckfinder/files/xubuson.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/89149440708.pdf
    • http://tokyoto.pl/UserFiles/file/satisuron.pdf
    • http://adhdesign.de/userContent/files/20210914032454-63248217943.pdf
    • https://sieuthimaytinhcu.vn/upload/files/mexipigabomafikewiwupepis.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b213d81ccd---58725980419.pdf
    • http://benly-carson.com/product/files/63612848324.pdf
    • http://rocb-ap.org/file_media/file_image/file/50220424588.pdf
    • http://szsahsh.com/uploads/files/nibuwetotilinidulenuluwa.pdf
    • https://molecult.metallo-tests.ch/sites/web/upload/files/35904515007.pdf
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/44617065826.pdf
    • http://www.shjkyq.com/up_files/FCK/file/53457843425.pdf
    • http://szerecsengyogyszertar.hu/editor_up/55996116078.pdf
    • http://yuhenganquan.com/userfiles/file/20210917160710_63371004.pdf
    • http://bestbelly.org/content/files/files/xilikabe.pdf
    • http://ozhelalikram.de/resimler/files/97220593007.pdf
    • https://angkorphotographyguide.com/userfiles/file/91868825707.pdf
    • https://serka.com/serka/upload/files/xisobojufusatenusuji.pdf
    • https://rubfila.in/files/file/70528696689.pdf
    • http://seanmore.com/userData/board/file/dupokoputu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d8.bin
eebf4189c4a9f454e9bd59f797a2b5f90f2023a2709ef1bbfd60b20b32afb0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 19236 bytes
font_01_sfnt_off0000ebdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16792 bytes
font_02_sfnt_off000103f6.bin
fc6f954ec6e3742257e2405f20bcba728b94e619c8a3fc726b9b033f7c1b53dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 10716 bytes

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