Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fbfa1dc1fd0f2a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 09:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f5c7ab156467d6654014b95fe81dc36 SHA-1: a07b0da2b9e2c99098b428fd7cf1e420b1c8236a SHA-256: a0fbfa1dc1fd0f2ae1c730d481ac480c6bff03b22b0bb9c0acb1342a7cf9ae26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or further malware downloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://lideparts.com/userfiles/file/1631387502.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/fukasobironubuxekuj.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/pisubipepesi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/meseji.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/7410654797.pdfIn PDF document text
    • http://vladekoservis.ru/files/86131541658.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109091014534786.pdfIn PDF document text
    • https://mimpidia.com/contents/files/sevixelakolifarupeb.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/lowonemorigoxo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161340aa673ecc---83755616967.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/dokelewijizasawajevasav.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/51583139958.pdfIn PDF document text
    • http://favourtec.com/attachment/file/27619197457.pdfIn PDF document text
    • https://medpressa.ru/files/file/moputiraruba.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/90981798865.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/juduxipataj.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/fagidazefudedaduduw.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gavulex.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/6491293295.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/disutoboponasaniz.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/16547571217.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/megineretebisabevipiduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tik+tok+18+download+appPDF link annotation
    • 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_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 17804 bytes
SHA-256: 85b41440299019e19fc1ad5361e0d4d2c30fcc345424f2d79f73af00a5e7b641
font_01_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 10384 bytes
SHA-256: 07cad9f88f39d87ae12c6deb462842fda1948eb44bdc8f686f1700624f8d85f6

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