Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f2441cdc720fc6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 02:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00cbb7d20b3ebde4669be46e6e107243 SHA-1: a5c489c8b9263c18270227c6f966cbc9862a6ee7 SHA-256: 57f2441cdc720fc61d468855904e955205b71569ffd37c08e5a26c90a5323fd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting, suggesting a tactic to manipulate search engine results or distribute malicious files. No scripts were extracted, but the presence of multiple external URIs points towards a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://randoquad72.fr/userfiles/file/xizuvaxutepefo.pdf In PDF document text
    • https://jensbrode.de/files/file/20157232124.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/43673770415.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/desejo.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/32458839415.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/91962173084.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dae3954a4---86843546695.pdfIn PDF document text
    • http://sua.vn/uploads/userfiles/file/zeguwalanoje.pdfIn PDF document text
    • https://heureka-cz.eu/files/22188188677.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd126b9428---fuluzomiru.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/zizadoxem.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/runilunonugage.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/93533719152.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/tirefemukogo.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bomezewasenugegu.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/rusosabudonenedavadaxu.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/ridefajinidun.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/66909134556.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/debafodamivetika.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/55398496110.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/87549491464.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/30670438910.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/295345520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=erik+erikson+theory+of+psychosocial+development+pdfPDF 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_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 17568 bytes
SHA-256: 8fe33eb7eefa8765cbd4af6867f6210e66acd8d43cae4ac9a9969f50b7e075dd
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 11140 bytes
SHA-256: b2fffe817698c0ae0a586844be85ffe4e93f4894e56e9db19f2b46847c66fce9

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