Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4987bc83d76660…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 12:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8de0e0eb7f3079d3b3578613ee4faac3 SHA-1: 643726a160e29e0556ab3716f4b0832bc0bc9b89 SHA-256: ec4987bc83d766602120a60cd89a68d6c85f51d925e8cf647d5b28765b28c34d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external websites, many of which are likely part of a link farm designed to redirect users. The presence of external URIs and the link farm heuristic suggest the primary goal is to direct users to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=online+movie+stream+english+free PDF link annotation
    • http://www.jindatunnel.com/up_files/file/kaxotumamuwitikipovexifa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614607a64cb28---tagubisoverubopowuzun.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/loxekin.pdfIn PDF document text
    • http://brenderup.ro/mm/file/ribenunemazexofofa.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/gadalubuv.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/nudififarovapukotoreb.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/90204446052.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/88025418958.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/rinewesomifutapirogef.pdfIn PDF document text
    • https://retta-bg.com/userfiles/jivubikigakewedow.pdfIn PDF document text
    • http://egitara.com/upfiles/files/48454478354.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gemimagasosazaliw.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/jofunipekakevup.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31247974810.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/domugoliturukoro.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/molopi.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/72320810599.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/59014680090.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/wonawosulavozeb.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/84762247118.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/gobudonufizomatakoz.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/33847049777.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f4da45f024cdd9ad4496b3f6c4acd347/gevoba.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/26471006888.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/94010084565.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_off0000b0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D4 10752 bytes
SHA-256: 54518857c17518d82ae9fe301361bdf03cdb6dd2a3ffc7c41afb532b374519aa
font_01_sfnt_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 17076 bytes
SHA-256: f1814e060db3581b2f2d71d3d4266e70625e8b0771e7063979178a1078dacb5f
font_02_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1