Malicious PDF — malware analysis report

Static analysis result for SHA-256 44607ba47f4971b4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 13:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a62576cf08a3695ee1499bc4e0da127a SHA-1: f002aad7a1fed4b727672383f422aa07f312c60e SHA-256: 44607ba47f4971b4875293d85d48ef312ee059d508d8c83230edc65b36f99872
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

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://dnepropress.net/files/file/45567872865.pdf In PDF document text
    • http://studiosaletta.it/userfiles/files/fosafoxuzadutumataraxij.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/50863269580.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/96188685212.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613714ff0abd9---vomajebuzije.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/27122059733.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/7585848745.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/60865672350.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109050822066117.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/xuxezoxaxejex.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/25150284473.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/baxorunorixa.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/79f69867364e71918bdbc508ba11b27f/xemetubuniwomaduli.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/zavisaro.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/mawuwatojeka.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/sirinewutuno.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/64951412001.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/nijugifamagemenoxofepiso.pdfIn PDF document text
    • http://allycatering.com/userfiles/13548310747.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/razepajededigobuxe.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/parosaxovaduxevinul.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/limakoguzuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=app+for+casting+phone+to+laptopPDF 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 10740 bytes
SHA-256: d0dbb7e665d1e79135546a676ed25a2ac20f6a64857e737f14475bdc4090e55d
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 17220 bytes
SHA-256: 1bc5561c1d837ccd3ebef11ca9eb0b14ba84979dda191021ddf56d4fbcda213b
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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