Malicious PDF — malware analysis report

Static analysis result for SHA-256 508e9f71b8028d4c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 14:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c50e7a92e5fd05b7ec34e7e71a191458 SHA-1: 5cf590d31be87001664f3ab6c1f6d2957d419d1f SHA-256: 508e9f71b8028d4c67a5d598f1d31f7488d2bdf20594d497317d06c0d183ae38
126 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 numerous external URIs and is structured as a link farm, indicating an attempt to direct users to potentially harmful websites. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=after+ever+happy+anna+todd+pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7356c6f662020a3b1a270272278b6236/32769492828.pdf
    • http://saydersan.com/firma/files/25847785742.pdf
    • https://endobible.com/userfiles/file/23195425535.pdf
    • http://mpti.ru/userfiles/file/11174652.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a17ec9d---94933852404.pdf
    • http://eptesteplelek.com/uploads/file/fizaw.pdf
    • http://borneneskontor-landsforening.dk/userfiles/file/18164072196.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/radawutixejube.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/zoposu.pdf
    • https://shibbirs.com/media/files/lilunonosudefeda.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/97495720986.pdf
    • http://oldadmin.k12cart.com/media/files/pewanakavisod.pdf
    • https://escolaalfa.com/userfiles/file/nutarivagaza.pdf
    • http://thenikharvconsultancy.com/userfiles/file/gotilomozominorivisekedow.pdf
    • https://theatresaucinema.fr/uploads/file/12152517460.pdf
    • http://houselandia.ru/files/90723221666.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/tageravaxazabemozigewu.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/72832682708.pdf
    • http://caudafotografia.com/userfiles/files/vojujewuxako.pdf
    • https://huuphongplastic.vn/uploads/images/files/suxijulanosinedat.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/84751191332.pdf
    • https://thefertilizerproductionline.com/d/files/82978697619.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de52.bin
54732f08f25902174d337d869720434f986acdcf61f9ad7a2e7d0c91cda3e5d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 10448 bytes
font_01_sfnt_off0000f603.bin
a6212a5c0057c058f59492390cba79bcb41dff2a302fc04473c04683ad044398		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 17656 bytes
font_02_sfnt_off000123a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 16792 bytes

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