Malicious PDF — malware analysis report

Static analysis result for SHA-256 493315caa5e0a483…

MALICIOUS

PDF

100.2 KB Created: 2021-09-15 12:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 887b16b79516c5949b645e4de76822a8 SHA-1: 0ba116d5cc6625fd16c66fde3c724d29697711aa SHA-256: 493315caa5e0a483da10fb70c5dc0877bcd95ecf80fd41ff91582d7ee35891ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, often involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://huntic.ru/uplcv?utm_term=pro+evolution+soccer+2014+download+for+android PDF link annotation
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417265ee269---17129690897.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/9250173803.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-13/20210913122333475631.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/nopibemipinebisejibulob.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/zapis.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/letijenite.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/berexijuvebelodi.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/72534396408.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/91606345540.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jigeredavaf.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/76380992724.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/80488479803.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/suniberutawedilorosifa.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/87573423615.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/jadokuvidalum.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/61517673997.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/66236703618.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/xunasovogonodatimofu.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/35083371748.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/44330251792.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/87961042402.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/fuxalewisipepozegaka.pdfIn PDF document text
    • https://sealskinz.ru/files/file/barejoki.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5utsobdcli34r3l1khc58p2uql/31278233624.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_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 18752 bytes
SHA-256: 7db1ac43776b9165aeb718215693aa7d2d9cd98ec9517f7a51bfbf695418208f
font_01_sfnt_off000150f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16907 11096 bytes
SHA-256: ca21b2a7a8bc3bafc6fa34eb097f2c9ecb03ff109472f28921a5500d6241dbb4

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