Malicious PDF — malware analysis report

Static analysis result for SHA-256 790f4e76a1e27ab3…

MALICIOUS

PDF

79.0 KB Created: 2021-09-10 12:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9cb263b62e59d33b2346b01525118275 SHA-1: de0be172f968d375a4a2de31368f1c2626fd8834 SHA-256: 790f4e76a1e27ab33c4373008771986582b99085b2f5ab95772e53b19bf2e8f4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier also strongly flagged this PDF as malicious. The presence of external URIs and the link farm heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=ninja+war+apk+mod PDF link annotation
    • http://wskinbody.com/data/boardData/files/revozafej.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jirexobumozujifarajujeru.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/82052163829.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/fagupalabatilana.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kusotenesodaxaka.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/dosugug.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/29352176060.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/66921832729.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/13608815588.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/lulixetilaziromaxuxi.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/46730641698.pdfIn PDF document text
    • http://centromp.it/userfiles/files/1231579527.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/3768499026.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/joxow.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/432e56a0c4ad8fe3c00f0fbf883fdbe6/lekirunuguropoxavunovitej.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/vixizobepat.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/50664706525.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/73267690258.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/guvivifokomemexevavo.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/21099534722.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_off0000d0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FB 17684 bytes
SHA-256: 7909d3df15558936430238aa7d408b82235de39d3d5dc21fb1a940b622707fb6
font_01_sfnt_off0000ff66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF66 10396 bytes
SHA-256: 76bbe6fd551692d2bf581fa6501d46b7f568a18ef57719c77ed70e8a539c8530
font_02_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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