Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec03e365f86822f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-17 04:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5443a1ed602faa4ad0f50ec330a90a3e SHA-1: 92a24e6b77b17d336b7c0ad890cee5b3059c03f0 SHA-256: fec03e365f86822fc11c97cf59145ff491afcbf5ff22ecc1a32c67ea6f98bc40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=honeygain+make+money+from+home+apk PDF link annotation
    • https://unifor975.ca/userfiles/file/88493447848.pdfIn PDF document text
    • http://jsdarvin.com/files/72015007105.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/bugufu.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210910040711_954626975.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/rejefidatobinigonuget.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/10962513224.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/bokilulemevujufuje.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/bozoz.pdfIn PDF document text
    • http://alkanboya.com/files/file///70137131301.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/merezosovavaxefom.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/papokenajatenajakudu.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/losazol.pdfIn PDF document text
    • https://termofriz.rs/files/34187269487.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7262da1d---bibukupubiwivebufe.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/39348964425.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8d819c54425caead22edffea48686a2b/welutazewoki.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/16309240997.pdfIn PDF document text
    • http://linza-market.ru/upload/files/xelibofe.pdfIn PDF document text
    • http://silver1979.com/upload/file/56927794165.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/gotufod.pdfIn PDF document text
    • http://prosquash.by/data/75141667412.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/65129061940.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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 10692 bytes
SHA-256: 55f2822fc4ef055d5788e2209b882af15e02a6d04f15c85258f40ef7880b4ceb
font_02_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 16700 bytes
SHA-256: 4037ab80304c3387b547f84a1863f1efd1d71b2ff3c2dccdea25fea7fe487556

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