Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40b89983b9a4526…

MALICIOUS

PDF

75.8 KB Created: 2021-09-09 15:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38756c102e5a865a7dd70f7276e895aa SHA-1: fde76cd200a9f133f1a6e6b56f88c8972990e751 SHA-256: e40b89983b9a4526c3619a1eab7127f535c2415f052a8c90c79e238433216dbd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to disposable domains, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=velocity+edit+tutorial+capcut PDF link annotation
    • http://rld-carbon.ru/file/nafejatamizidimujabupubu.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/xeradaj.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/tamadilenijiza.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/lufodub.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gewezukirozepiduxade.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zewenoperejubepogujoji.pdfIn PDF document text
    • https://afayl.com/userfiles/file/33945695442.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392362f0e61---tewaxabatuzemip.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_04806BCCDAB6EE23.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/060315268704.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/jododo.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/43439372821.pdfIn PDF document text
    • https://aildf.in/userfiles/file/gigufipiju.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210907080707.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/20275509272.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ca68e070---manupovopulubosajofixos.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/39984260220.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/xigis.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/fopezo.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/sugupaw.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_off0000bdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF2 10416 bytes
SHA-256: 12108792923fd3ab47f976e34bebc4566a1be3a943c0efa108cc267657093aea
font_01_sfnt_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC1 19660 bytes
SHA-256: 43d0a417cbace771d762e51d73664adf137f4979afe512504dc7dd4ed7fa3025

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