Malicious PDF — malware analysis report

Static analysis result for SHA-256 027bfa09528a646a…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 22:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 329c3449bd768b6c2c6faa5f6e1d249e SHA-1: 268cfa50e2b9f6f58648e0d7b9fd4c65d40283f3 SHA-256: 027bfa09528a646a4290edb4cc943717311eb033066138d0e3a3ccabdef961eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the overall detection indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://studiosaletta.it/userfiles/files/nuwesajilumemob.pdf In PDF document text
    • https://webmenuplus.com/images/file/tasovogimivukunige.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210918073003.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/6439822220.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/vajufegeditivenojuv.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210902082925.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/sarasewasewudajiz.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/budidemerazozezizabedu.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/26192330041.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1k8gi7e4ro1g1lev0q6rp6ksr0/70849969899.pdfIn PDF document text
    • https://iword.de/userfiles/file/wabonafimigupuzano.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/gikuka.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156c633232d0---moseta.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/71021759790.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/99671664731.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/99407536567.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/laxarikeritakaxozokupemu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/vinuk.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/fupewirapuxolilolazi.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/27837135932.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/suzoxagoguka.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/namotasipesofumimasukef.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/puwuvumijuroburu.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/daxovor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=4+feet+4+inches+to+metersPDF 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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 17256 bytes
SHA-256: a4cb5e117cb08cf7594cd29b78fcc14c22e01bed1641cb7aa5d0024ee367f704
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 10376 bytes
SHA-256: 809182f788582390abfc9a1bc2edd4ae4ee770dc144eeec38fb56928acb8e4bb
font_02_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1