Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e09cf1b2a337c2…

MALICIOUS

PDF

91.7 KB Created: 2021-09-09 05:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d85f3925acf98d327419a3fd5a0c2872 SHA-1: f7b908d8069a54ade17d41ad9f8eb68dc2865ded SHA-256: 41e09cf1b2a337c27a24057a7fef8b735dcbb30026493eda15a51bc2cea7c856
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 0.9913

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://pixomot.ru/uplcv?utm_term=free+robux+for+real PDF link annotation
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/95136534287.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/3564848349.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/41392415607.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/86612664887.pdfIn PDF document text
    • http://fedime.org/imagenes/rogipirilurumalowedo.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/fenug.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fe55b9ff---89731624772.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/lilaxibefuve.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/vezemixakavofupiwotadiku.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jupet.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/nipidasuripezijal.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/58979525753.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/vavisadatitovuluzizipa.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/26261808199.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/86413159411.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/56875626236.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/30014829900.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/84949783541.pdfIn PDF document text
    • https://baongochoa.com/upload/file/13424205325.pdfIn PDF document text
    • http://tipiland.net/upload/file/39555373728.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/dowisupunorimukoxutot.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/goromiga.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/845a5a22168ba21a12082eb18520776b/katigiwakulabotexusup.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/76913564548.pdfIn PDF document text
    • http://df-2.de/images/daten/file/39837484413.pdfIn PDF document text
    • https://efnnma.org/files/file/83141371409.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_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 10064 bytes
SHA-256: f874e6ba73f86e62e331871283b8de868c59b1a65763acba379bcf6090550a55
font_01_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 17692 bytes
SHA-256: f20ee4ea31087a7e150b1a5f987773e98e7def1de9aafddbaf72925ed7ca5d88

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