Malicious PDF — malware analysis report

Static analysis result for SHA-256 db169091223bfe86…

MALICIOUS

PDF

88.4 KB Created: 2021-09-10 10:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 971a594f0734d78f57018ddd56bce6ee SHA-1: a6697e26e33613dc443fb987f2acae21b3fdb2b7 SHA-256: db169091223bfe865af62633ab8de6c3de3c6997d63b699360aa705bf7335def
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=pixel+experience+mia1 PDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1b569f53---lakufubomuguvavozoni.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/fiwumabarewivaxu.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/dbdb682f6b450cb57b798f3379b6d476.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-10/20210910102529209008.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/24563527028.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/dowivelaxurabimosot.pdfIn PDF document text
    • https://topupdana.com/contents/files/tebenubuxovo.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/27544773036.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/64694963854.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/divafulinewuwej.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c38ec360a---10548345481.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210902131402.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kulisuj.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/10939999407.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/dupujezoparisuwiwaguvez.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/94060023374.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/fijujigekuwipalesekaxixe.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/64749264829.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///kunetobenutinufubeg.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/vovujiladojubasasetimonik.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/garesarakoxesa.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/83367129264.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/zewenoperejubepogujoji.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/32422978244.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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 20648 bytes
SHA-256: fbaa1763ada96bef93f6a836e07195229746c733f79209aba672fca44b066619
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 10304 bytes
SHA-256: 75b88e0c81d743a63f6dd6d889ddc582ca84cd5c14d78bd3ccb5af001c74be2c