Malicious PDF — malware analysis report

Static analysis result for SHA-256 b288afdefc5e9572…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 13:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 97c08ba7b24b719b99cbcfe7f2d721d0 SHA-1: 1e1aa7b6b01f8d0da10eb79d77c9f51e7882a229 SHA-256: b288afdefc5e95727faa87cb86dc5c8c46005f076a54fcbd421e79eaff8f80e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs further supports this, likely directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=browser+apk+android+2.3 PDF link annotation
    • http://visusmarble.com/images_upload/files/33968686339.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/82944897717.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/giwusazimemivizovi.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/96877727182.pdfIn PDF document text
    • http://theponghop.com/upload/files/93315009631.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630950384_a7ad23a030.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jutijowejufesitovu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bidufavumejosijeseruxelib.pdfIn PDF document text
    • http://qwerty.pl/_data/file/pesaraxejezumokerekog.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/fufufubazor.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/45285059993.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912203423.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/49537466231.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/nusomogi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614183b5ca1fd---90966185813.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613802df01bdc---89687434538.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vanokipekapimakunowido.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/ridanatolujojatiju.pdfIn PDF document text
    • http://susutour.com/userfile/file/79515338231.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/72051441852.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/42911528890.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/91782933462.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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 10828 bytes
SHA-256: 05af55f2b630ce0f8ee1e43853e2ab0f47aaec24964f4d1ba5be3a8ab5b91896
font_02_sfnt_off0000e2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 17768 bytes
SHA-256: 93b939a5bce3c361952d1e515469798ea1640ebf1f567be8214744c2bf867b59

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