Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59077143b5947ff…

MALICIOUS

PDF

68.5 KB Created: 2021-10-02 11:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0443ba9978c407ee6639a0dd9482236f SHA-1: 105bbc1744991fade5fee0787d39c8c3c038332c SHA-256: f59077143b5947ff0d0b351a9c78779fe113614b9a71ce0114fbff66a810e96d
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 domains and are structured as link farms, suggesting an intent to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=how+to+see+someone+else%27s+snap+score PDF link annotation
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/nutoxowobonedexo.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/pusotexomupadivine.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/82207126357.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/74913388420.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/sisunexixivata.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161476b2d9bf18---rasonufepenulekopikugup.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/dizir.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/tulezegolilekakol.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/girobizikabomopuxatozole.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/denebokovamig.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109111918579651.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161381b95f2d3d---25443945073.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/10465265969.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/silagi.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/76239510979.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/najiza.pdfIn PDF document text
    • http://bakoca.hu/files/file/3203465192.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/nizesudeveda.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/44432862738.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/pepenudikobosutatomonimat.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/wupiwa.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/10792760348.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_off0000ac6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6D 10556 bytes
SHA-256: 85b3459b0b674499efc510a5625d054cab81aeea1cda85f257248f63e77d2651
font_01_sfnt_off0000c490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC490 15628 bytes
SHA-256: e43be655413e4f770be4a71a1c9fd87cbb2d0a92d7dcc8e509236abd9d4b6e17
font_02_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1