Malicious PDF — malware analysis report

Static analysis result for SHA-256 792d6f11338d966c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 01:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e1a9651f67cdf9aa471538ceb52f01c SHA-1: 7b413961c6f7c17cad0f7146931f84d31bb54b67 SHA-256: 792d6f11338d966c7244b1246e5ab1b8adbe867fa5e91fab8be71efb0b160aec
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://synerhu.ru/uplcv?utm_term=firestick+stream+from+phone PDF link annotation
    • http://uralcomservis.ru/crn_fls/crn_files/13528291384.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/98284663357.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/92411681429.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/gugazavuga.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/waboginisuvowadubum.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/ligas.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/dogixigabejibilowanulojo.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/47920595653.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/togidojesomexavik.pdfIn PDF document text
    • http://mayjack.com/upload/files/sopuru.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/faranoxorukan.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/56277277448.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/1042414184.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ladikagefofobogugikeduka.pdfIn PDF document text
    • http://industra.sk/userfiles/file/22713685205.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/wodesutopurapivaxawifapi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/pijamarifunurikafuvo.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/20931815759.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/nakex.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/35083125511.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/tojorusudiporajamubizetas.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa8fb59be---tigitikozalegawut.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/tajejuxer.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/wuzuxogukodewusav.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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 10768 bytes
SHA-256: 92aa8be8c00505133cbaa5c0d02b24f10c10ad2257581d37ef24e7dc5307c8ad
font_01_sfnt_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 17640 bytes
SHA-256: 54821a8987f766c07f3cbc7f32a7346404f708a5efbaabfb6cfe19eac90aa3b0
font_02_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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