Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15f288f0232278b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 11:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a1401edc312a02e123ba8e2ec2265b9 SHA-1: f8b4ad66da27f8721199fc1be1d07a8aef2d51d0 SHA-256: b15f288f0232278be606af45dfd91f3baa6375f7c547d7e0b44a715cc233c91a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9977

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://synerhu.ru/uplcv?utm_term=download+game+modern+warship+mod+apk PDF link annotation
    • https://dpt-mh.com/uploads/news/files/42048449572.pdfIn PDF document text
    • http://intertravel.hu/_user/file/sozati.pdfIn PDF document text
    • http://packamate.com/userfiles/gepisijajebipiwuku.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/32837136079.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/sisimesujozekubusuvok.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/53979853932.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/71177133331.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sasipuk.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/91053058916.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/viditarebelesaxunarixeru.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/28718306190.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/puvupilakufokapajutes.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5rvvncnhhq53nv5r3n915c90o7/xazegutuwodad.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/dozosidero.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/34998700962.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/sevamazebugofexunufe.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ligodekelokixamu.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/48989907004.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d738990ef---nalazinese.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/mepufifuwajubebovotibibux.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fopiwazapowilonabipagex.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/1504324060.pdfIn PDF document text
    • https://pratham.one/file/69704133499.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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 17116 bytes
SHA-256: 64efb75b8614900c747ff0df5f36a705201145eb4316d06b11baefcd8138ae0f
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 10920 bytes
SHA-256: be47f3b64e1a8689bdfffd5d69bd52cac68fb33f00838e90cdcbe7057c7bc519
font_02_sfnt_off00011c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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