Malicious PDF — malware analysis report

Static analysis result for SHA-256 2412e40871f1e435…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 08:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffbd34df59710ccff7a6d5a758e3db7b SHA-1: aecc4339b777e284a906e6599e11f4d839a5a9cd SHA-256: 2412e40871f1e435d977d11533f3b2b7855d58153d2f4ef49533f15e5836cee2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ortopediaszombathely.hu/editor_up/lolovubodigozawaridoweza.pdf In PDF document text
    • http://tvsatkrosno.pl/userfiles/file/36263346654.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/pubadode.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/wolibogiguzugunaxuzotu.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/76549534830.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/ronumuferipawixejo.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/zusogejilapegebekus.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109022315427562.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903184721781464.pdfIn PDF document text
    • http://school15-tyumen.ru/f/dumabopel.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/40445342840.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/62c54c6da639576f8dc9ec697a9094a6/rifinivupitur.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161339a0a00f5d---kejalubilazedokilin.pdfIn PDF document text
    • https://digireg.nz/upload/12134390508.pdfIn PDF document text
    • http://castel.lu/userfiles/files/rubozuk.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/woroxosebotovabonefir.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/46862155445.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/65719128972.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/mijaletom.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/tadofovatelowajigilab.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/62753748083.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/kirubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=libaas+by+kaka+mp3+downloadPDF 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_off0000c7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 19144 bytes
SHA-256: f2241bad54297dd6caacd37862515c4aa1eca18cc2708bc9db8ee436415ca585
font_01_sfnt_off0000f9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B7 10784 bytes
SHA-256: c0fdb5a5ce76fe68fe4d901401942357f0594a7aa91bd1f6408a8ef5d40fe4a9
font_02_sfnt_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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