Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68433dbc36b2e14…

MALICIOUS

PDF

72.4 KB Created: 2021-09-21 08:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 241fe0d2f2881dd131460bcff83577ff SHA-1: b16a163906cb840ded4ff31fde576c7f8d3c1650 SHA-256: e68433dbc36b2e1480650fff0da4191dbf595c3cb790fcf55ef4318b69de6adc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=head+first+servlets+%26+jsp PDF link annotation
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc5226dfe5---43269972935.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210914052012.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vurese.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/zetusotosakemavitiwib.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/75700125661.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/13578778187.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/46920596561.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/gapojigexidaxinevenoke.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/bejonosisodifomuruj.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/tekanabifegeroxaxopiwin.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/kogeritukexulelorefuso.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/sulejapusuvunodajipaseket.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/60525243876.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/9ebf2fb7b77452aa6df4ce7845b0b9d1/folizoribimavor.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/52280211258.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/demunojore.pdfIn PDF document text
    • http://salt17.com/userfiles/files/87442432157.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/gexunozi.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908091406254308.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/55082032466.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/93056824710.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/40965193325.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/3642911094.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_off0000ba04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 10180 bytes
SHA-256: 7b65c927c24e54c7ba48df57b2920d9663c85506dbace1b76a480c26da178cca
font_02_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16576 bytes
SHA-256: b3d65d611b97a6f70ce42763059f894cd2bc351027901be5af3086d420551de8

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