Malicious PDF — malware analysis report

Static analysis result for SHA-256 3279f72cba321d96…

MALICIOUS

PDF

85.0 KB Created: 2021-09-11 01:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d280e7cde0aa1f3dccdd36472b0f933 SHA-1: 2651f332e9c0fd7e0b46a2ace9f08888c10d2092 SHA-256: 3279f72cba321d96ef2bc8b35300dc6259dc0a0ec5297e7a3cc64cd05239ba9b
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 0.9974

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 https://coretry.ru/uplcv?utm_term=doctor+who+judoon PDF link annotation
    • https://topinsolventa.ro/userfiles/file/53588510839.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/12489863877.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4650d03d3---10320125788.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/91662982185.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/noxogizatekelakemekufora.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/21197082243.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/newazunolejibedisexopoz.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/mojorow.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/22140142831.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/77137378436.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/42943070940.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/tejufavoxumanofenudizun.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/xozepagazikajelilajuvel.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/volodaromu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/xakojepizewiwixubexas.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/fokepudesibikugokuk.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/26857624112.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/84440571832.pdfIn PDF document text
    • http://neteyes.eu/editor_up/rokivufejejutiletubudu.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/58876005286.pdfIn PDF document text
    • http://kag.fr/userfiles/file/gokagugufusibelek.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/10235383623.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcba55578b---77395363949.pdfIn PDF document text
    • http://snsi.jp/image/news_file/peguwakujojefu.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_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10184 bytes
SHA-256: cad1dcd7a8653560a694c7432e92d9db36853de2679d60b662af5e8bae00aa3c
font_01_sfnt_off00010337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 16684 bytes
SHA-256: d6f8c1028fb30c444072d5295b1d9d89777fe514a9d1644bf598b2738fdc5756
font_02_sfnt_off00012e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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