Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d53a25919976f7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 13:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0cf1c3d46edf21d8c6a21a7cb20f833 SHA-1: 7c1e18ade61eb4a122ed2edd9749aefa885e0a72 SHA-256: 88d53a25919976f76fc090b18d68595600b1b5a57e9fa5d7bd4dec5645458c1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=english+is+fun+2 PDF link annotation
    • http://peak-experience-europe.com/images/blog/file/jagupamoriru.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/taruneliwup.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210918052716_0kvx1r.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/99770368309.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/misuwuxovesivut.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/58608836382.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/dixena.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/67602742649.pdfIn PDF document text
    • http://xhzhengli.com/upload/12485958611.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/1238984638.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/movajatinixupur.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/40695584936.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/vibamovufujujaw.pdfIn PDF document text
    • http://live-net.it/file/ditofekakosizenutirudore.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jqn3ti9u8pb8aq8bd2pohatou0/somovojejivawoxinula.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134f86564280---doselisijux.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/palowadowumufo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/muzita.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-3/20210903195804402420.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/86847419265.pdfIn PDF document text
    • https://italvaping.com/file/domubozosoxefinoguga.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wojifewanijuw.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_off0000bd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD06 17128 bytes
SHA-256: d633f3c93a97220705e1ac4adc45c368119fcfa842dd5669b45649723d1b67b3
font_01_sfnt_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 10084 bytes
SHA-256: bc0923d4f0f7439b3e6eeabf9edfdf1452d29a5b3fc6a4f9b9604cf95863153d
font_02_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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