Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1feb58ad0066848…

MALICIOUS

PDF

76.9 KB Created: 2021-09-23 02:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0995cac56fb762226f06ee717273ecaf SHA-1: e6c2d43b20de1e3616977eb0bc835383c2ca88a3 SHA-256: d1feb58ad00668485d664d9bb325d1a70cf0d0018e65105d3efb11a8f2a14c49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://catamma.ru/uplcv?utm_term=enable+voice+to+text+android PDF link annotation
    • http://llux.vn/uploads/files/dirabamojitamol.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/29559504833.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vuluzexipotadinamu.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/96642641280.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/maxebinetexu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb7144a30d---zefujexorewiloxuxuz.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/gitisunibazerifowotimew.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/67872453899.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/dufidufi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/ropumunejumevomowiwedaraf.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/deguwaguguje.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/neberagul.pdfIn PDF document text
    • http://congluc.com/upload/files/98769545920.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/65101514848.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7a0a1e3a7---4310831313.pdfIn PDF document text
    • http://saint-party.com/media/file/sozalepoka.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/6c1562358ada02fcd9766d2d0dbde4b7/17414782158.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109170514409320.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/78094057685.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/20982377492.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/38069922979.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/zajemusikuna.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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 10488 bytes
SHA-256: c0e562a289cf224427cdbbf6f2658a0315bb87ddbd42599f83878acac6d518af
font_02_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 16984 bytes
SHA-256: e4b1a2a33f59b168ab43768b7a72a4939805e08627ec47d3e4260c3df1bdd9c7

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