Malicious PDF — malware analysis report

Static analysis result for SHA-256 92282bf02efc6f31…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 11:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8da5b622a73fd6c58700832d55999758 SHA-1: f7a016d70b8a50dbadb9c3b6fe6a155d7f0835e6 SHA-256: 92282bf02efc6f31285120c7e51c0ce65bf96fa6a46817d6ab0a64fe3cf3d78c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also includes numerous external URIs, many of which point to potentially malicious PDF files, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://robvancampen.nl/userfiles/file/zuxen.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0r2sjs7i9c03oecf7i2k629j8/rufafuwusuzovifez.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/gelipori.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xelofobofarebemosufuwifil.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/55734720318.pdfIn PDF document text
    • http://bociany.sk/media/file/30219965398.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bed3un3rdcc31vjoen0avm9uef/68875741279.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/janujereri.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/66269721266.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gesafizalit.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/38030814034.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/42110742484.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/libabakiniremilisisowewuv.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/32172805690.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/jigajuxigikufideleter.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/46245579400.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/64601231537.pdfIn PDF document text
    • http://rideco.hu/upload/file/dititajerijefuvoxugiva.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/96926878255.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/sogaxavase.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/jobeku.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/90599488029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=psiphon+pro+play+storePDF 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_off0000ba55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA55 10464 bytes
SHA-256: ecbe4a947d27ab09f8820da7695bd34c14cb8ce0aa161f36856697b359aa2900
font_01_sfnt_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 17896 bytes
SHA-256: 9f00580131ec96e45abb413f142ee2aebafd96ab7b684fb906616f0bb634773c
font_02_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1