Malicious PDF — malware analysis report

Static analysis result for SHA-256 05031607ab2756d9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 07:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efeafe1716d87b95beb8593f69b9a3a8 SHA-1: 974524d14e3ed8c21cf4b00b410357087ca34e9e SHA-256: 05031607ab2756d99dc102378f525ad8691852252c5ffab2b5a618226bd8b121
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/64308605821.pdf In PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/15446409053.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a241b05e9717b378cca6a48b988a4b1e/38511135319.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/33458618564.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50766344717.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/44876649233.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/88552300304.pdfIn PDF document text
    • http://a2designbg.com/userfiles/file/larujusi.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/36732349019.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kusolekofar.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/sirita.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baa89eabcf---98254941210.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/tonidegevuwan.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/jesod.pdfIn PDF document text
    • http://elitvorota.ru/f/file/79375440335.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/80663947565.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/dafija.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/85810515400.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/parezuje.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/89102682780.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/sesolesevosuvuzet.pdfIn PDF document text
    • http://cabini.it/userfiles/files/gozukopivadulajeridutife.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/nigiduxisaxexilidaziv.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/37268171694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+last+sherlock+holmes+story+pdfPDF link annotation
    • 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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 10860 bytes
SHA-256: d381cc764cf9d1fd01b8e2bddd8b4a0ebf5031a691b9da8abd993259a7b16973
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 18228 bytes
SHA-256: c1f3d47088d30c35600fbd034866ca927d452ebe13bc310d6f23b40f305c3ab9
font_02_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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