Malicious PDF — malware analysis report

Static analysis result for SHA-256 e949704873a6ba55…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 16:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4f089dfe31edd839cef7a3f4b9b0d3b SHA-1: 631d95dbc64af9705ea727d12035455fdb9a35c6 SHA-256: e949704873a6ba5514f3876342b791e3669f2ab871b1b01071dc0c891885a5bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=is+canned+spinach+as+good+as+fresh PDF link annotation
    • http://bong-dem-long.org/upload/editor/files/32633072868.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/furegubanurepo.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/34051679536.pdfIn PDF document text
    • http://tavio.su/files/file/58267024339.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/68601799519.pdfIn PDF document text
    • https://iwistw.com/upload/files/boperodesewo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/roredumowivo.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/39251324761.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/81643941396.pdfIn PDF document text
    • http://at-studio.tw/app/webroot/userfiles/files/20210909_223254.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/fewafuvirinojalan.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/68430326620.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/miwedovexokilazi.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/zipimowidimilekan.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/54277887747.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a3c69a67---vaxenovapivibamibejiful.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/wirukadav.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/31965648664.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210912012252.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/85889127252.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132836c19278---sogakogoxozetex.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/vemigesevopatoxugijeliral.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/31629912444.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/12835300663.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_off0000bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 10708 bytes
SHA-256: a87082d1ccd194125f9b71dfdd80ba7409ae8f8455ea41d4140cfb2a6622ee9f
font_02_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 17272 bytes
SHA-256: 6dab64ae27371f2b1b1d21e494d63cf712e637187476b579ca8b6f9195a2503f

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