Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af112b7593bde45…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 09:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acc5604e93c16e85f5efa8b53d71e563 SHA-1: 53773b859f3e21010cd230503be22abd9adb1c4a SHA-256: 7af112b7593bde45dc26c1455a6af5f032dc3a12f00e90a43b4e59d1fc68fd4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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.
  • 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://coretry.ru/uplcv?utm_term=dua+for+health+quotes PDF link annotation
    • https://attack.lt/images/files/rinorixevata.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109021257167150.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/74311530118.pdfIn PDF document text
    • http://zamgph.com/uploads/file/030751518092.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tozarimanobuvamogexi.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/woxawijisosiziwurejalono.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/sisupisetuturaxolarut.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/dirip.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/8442895604.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/20172555184.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/20718548692.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/71116194893.pdfIn PDF document text
    • http://parentini.it/userfiles/files/46679084430.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/3593611156.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/26909846038.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/12231095713.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109031520311278.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/44848374513.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/34316198903.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/xatuba.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/93810783.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109041454567489.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352c331461c---lixakawogupaxavibif.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/39489463121.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/m0r2sjs7i9c03oecf7i2k629j8/rufafuwusuzovifez.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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 15576 bytes
SHA-256: c5efa62f09ed54d7e48607e6ff65a230dc226cbbe377e854f0f6a98370633df7
font_01_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10364 bytes
SHA-256: 0782418092b4026135e4a3fd25103183052dcff83971fe4b16401c9247e45bef