Malicious PDF — malware analysis report

Static analysis result for SHA-256 6804db853a174c05…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 17:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39af08dfc56a69764a73378dd52c6e2c SHA-1: 18b6ee1918123b8ba4fd52edddeaf1199f8a2e39 SHA-256: 6804db853a174c055a311059cd1498caa427ca1b776a0b6c66cac5801fe7a3a8
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 trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. One prominent URL, 'https://irlanc.ru/uplcv?utm_term=download+vice+city+for+mobile', suggests a lure related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://irlanc.ru/uplcv?utm_term=download+vice+city+for+mobile PDF link annotation
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/31236194054.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/41975524458.pdfIn PDF document text
    • http://alcantara.cz/data/file/bujazaxur.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/demadogexat.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/lajasaparim.pdfIn PDF document text
    • http://104408017.linker.tw/files/juposuwutajevaponigo.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/91003804576.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/93527473600.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/99999959175.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/36874109767.pdfIn PDF document text
    • http://www.ezmoving.com/file/buwusosameluburaworuwa.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/wevemufos.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/20602698378.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210914121555.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/34359739584.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/21927426355.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/bepuvexufidubavewe.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/7811284711.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63b4d059f---5881668647.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/duzumupigogirevojezob.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/begidipap.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/jexiwomowo.pdfIn PDF document text
    • http://come2menorca.com/images/file/fagabowe.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/rugilubi.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/71579316323.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f2b3a5c4d---91703150130.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_off0000ba79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA79 15320 bytes
SHA-256: f966b2d2571e1b41fb90cd212fe33bf4dc0566db56022809276a673372d5c73d
font_01_sfnt_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 10876 bytes
SHA-256: a252fac372893a24a1be3e00793e4e07acbcebd759833fd274d422ead4dfc56b
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1