Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cb109c882d205c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 13:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f08e6926b4e8a4290ac3757350db385 SHA-1: 011cd7d805ae1a20b4b17d99d35ef3c1f4001ca1 SHA-256: b3cb109c882d205c6e909a06f106fdf0c491a28d4005ad5bafcd73cecb8fb217
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://laborke.ru/uplcv?utm_term=transferir+archivos+a+android PDF link annotation
    • http://movesearchesuk.com/userfiles/file/39530166642.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745ccadee4---87473056738.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161327f7763969---11486061988.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/pejebojuwokesalak.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905021507996896.pdfIn PDF document text
    • http://jar-ted.pl/file/bufalivazenosovaborefu.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/kilegow.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/fatugidakanigib.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/65118230671.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/semomepotipakosikupufonig.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/pezusutevugubetudodew.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210901225436.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/miwuwi.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/jojajifonogimabunamodep.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/6292369396.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/muwegesuzotu.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/lusotuzolulolotebuxenuzok.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/kobedudetu.pdfIn PDF document text
    • https://wonkingchina.com/d/files/61020643739.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bajufifedilelilepe.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/23640999859.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/40987260961.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_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 10456 bytes
SHA-256: a51400ca468fdec5bb9a762c70bbb4ff9201dee68bffae1a02ddd4634572e853
font_02_sfnt_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 18964 bytes
SHA-256: 90ce94b787c21cc159ed2158345207df6c48cf543c4337860986273b36db27fe

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