Malicious PDF — malware analysis report

Static analysis result for SHA-256 be46e86f6c6191c3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 19:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e1b21fb9ae73bada72e45055b612fcf SHA-1: a388431b61de6515544514b5c83c0b701852ac8e SHA-256: be46e86f6c6191c303dab70a9432cfca13ed72a87d10dbafd94555a06f2278b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous links to potentially malicious PDFs hosted on various domains, including one identified as disposable hosting. The presence of external URIs and the overall structure suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amsasecretariat.fr/userfiles/file/tuvudos.pdf In PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/gigadaboga.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/36768899840.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/59144524820.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/nukaxuwi.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/19542302885.pdfIn PDF document text
    • https://redac.ch/upload/sogijuv.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/bijirimefusifaxe.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/jiwol.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/78102785870.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/vilisuzolasise.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/raxufokovumaxa.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/kefurezigiwusenir.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/1908621789.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/wezazebuxiwifo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa1911701---wovukefatorefilifurisa.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/88448251671.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/wevenonakevupoxo.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42016008023.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/robufoneriwixoxunive.pdfIn PDF document text
    • http://sb-78.ru/files/file/89589392517.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/kitokinoratavovo.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/rupetadutosipiroxiwopa.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/24915700865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=transport+flight+simulator+mod+apkPDF 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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 18848 bytes
SHA-256: 8bbde79dcbd684f0b2b2af5e0392a482a6724fc0a9a0e3e12d591fb68dfdd94d
font_01_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 10968 bytes
SHA-256: 787d55c51678c156eea5d439f6140d5cac9c24c0bab52352d05c6345bc5f4a3d
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1