Malicious PDF — malware analysis report

Static analysis result for SHA-256 291f3ccf86c8acb1…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 22:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 66da8e2b9e3fc44d4928733479437e95 SHA-1: 2dd5851c8bc5d4819424412be505bc9718b80a83 SHA-256: 291f3ccf86c8acb138cb09794282d5f7ca45abd18b5a4e97434af432fe47c6b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=minecraft+latest+version+android+free+download PDF link annotation
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/65719853560.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/zakewaxawagan.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/kewogavijo.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/21055495772.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/zuzalezuju.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/sexebapimorikawu.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/faxuleremajujosomewat.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wazanajidepiwok.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/junaburutebupijukogilize.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/88027282694.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/lunazimujizomaf.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/76301995537.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/mogikepulanivefexirowame.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/68386697216.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/98408308800.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613914238b907---12555619833.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/25174641875.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/fovigexisizimuvadezi.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/zorukidev.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/82437921943.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/kuwewopojinodiruforef.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/55328693777.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/68731685249.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mosilimunotuwewedu.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_off0000bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC5 10612 bytes
SHA-256: 6fe486fe4fcd28353b17ae7c7aefb1bf55055f4f54d5abce2919562664329a5c
font_01_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 15864 bytes
SHA-256: fce951876e233b54251c78b1ee5d1a5d0388e1d1d15e002cc70925e3527b083a
font_02_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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