Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce637cf1d521cea2…

MALICIOUS

PDF

91.7 KB Created: 2021-09-19 19:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d823ef974d4788b08467c7403f75f93a SHA-1: c436ba806d610f0b748ce12137bb14a0705fbc0c SHA-256: ce637cf1d521cea2126d160ff955a269721969f116078dbedd17d02e2655416d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are on disposable hosting and use UTM parameters, indicating a phishing or spam campaign. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=the+addictive+brain+pdf PDF link annotation
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b3dfa9f1d---puvebovunixediwirebe.pdfIn PDF document text
    • http://hanauhrova.cz/files/71996108054.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/zofawunapulemax.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/72985863254.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46759706384.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/gekuwonadudebolipaveba.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/68793162963.pdfIn PDF document text
    • https://btegypt.com/file/kibosax.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/rajetupemi.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/632e81105cbd5b93473d32f52a6eca50/dadopozitajutoguwa.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/bimedaredomujodiwoteguza.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/pepuv.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/xidafexavejo.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/7652498747.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908085501.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/zodagoniwogaborisir.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/xolum.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/54103839422.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/3021894381.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/zuneb.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/77002881526.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_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 18656 bytes
SHA-256: 50c26676abdd5f672a84571c8b92df2887841a7c9a5dbe2045cf9c8f3cb52e33
font_01_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BD 10552 bytes
SHA-256: d7dc5c9c35066bb212aa4e1d21e9ea6810bbb095b2b90607f32e0b1279f8b169

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