Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e2b46386326d37…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 02:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 319bb13b48fa0ede64feabcf18ea31f0 SHA-1: 0e578c77bf4e3906c985438739c679d1a795fdf5 SHA-256: f6e2b46386326d372b6fe29b3f8a12dedd8d27ecd4c42c524ead728aa284a227
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristics indicate it functions as a link farm, directing users to multiple disposable domains, one of which is associated with a potential application download lure. No scripts were extracted, but the overall structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=thoptv+app+download+old+version PDF link annotation
    • http://stlnsk.ru/uploads/file/nodezalofekoxopovugidofej.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/23497405057.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/lokiga.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/tuted.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/98464743996.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/52301442051.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/mijanaribimekilosimipez.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/biwasa.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/susojagikotazixuji.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/virepo.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/rogafuxaba.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/pizaloxipu.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/dawewiguxazurutagijawet.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/vadotavulixezivovozona.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/19448903114.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b79cfe6a63---75155820352.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/3722811652.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/47084164431.pdfIn PDF document text
    • http://slovoveri.org/userfiles/93698086013.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/badupulanurokomowuvi.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/tevusewabitorukonabar.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/56851771199.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b4c95683---15685687121.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210911_202253.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/dipazis.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_off0000e58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 18684 bytes
SHA-256: a6e7ec23a299baee1cd308b71bc8158dd1858d606dbbb633eb4236ebda335bb9
font_02_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 10604 bytes
SHA-256: 171a49d80098f639cab86a307e8f153a1c07e2c174d6189f8b86181e31498481

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