Malicious PDF — malware analysis report

Static analysis result for SHA-256 881a9c26c59d1977…

MALICIOUS

PDF

72.5 KB Created: 2021-09-29 06:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 971e9a78904b9185f51ce6c6883a6ce8 SHA-1: 6657fb0bf825ca47887c79a03b37736dccda0a11 SHA-256: 881a9c26c59d1977bd5bf0d5c8f8319be3e91e9260fe4ae76e3bc158c37b93d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, including one pointing to a potential phishing lure with UTM parameters, suggests the PDF is designed to redirect users to malicious sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the interpretation of this PDF as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=indycall+pro+mod+apk+download PDF link annotation
    • https://kingbakerypans.com/userfiles/file/jalatabivanulipamimozi.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/diguwaxibodewuv.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/ravanawivigijuduwej.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1d14765290ce27b52712fe9be301593e/funamekiporaginoneg.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/47475662890.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/dewinijamedawolujixome.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/81970491869.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/vosumawulawowogireturabe.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/84686095872.pdfIn PDF document text
    • http://vkts.se/userfiles/file/vufanutinus.pdfIn PDF document text
    • http://klinok-saintp.ru/files/57742653886.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/fijutitaxijamogu.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/24644049040.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/89060153798.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/favisarenifulajena.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/12588784152.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mixiboda.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/76551698370.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kituwuvotufusem.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210929060745_9e8ax0.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/57097989451.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/49923237284.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_off0000b5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E8 18348 bytes
SHA-256: 0f3b8fa49146ea12b1008b3cc151c80fdb440dd13faef970eeaa3fb2795c294d
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 10428 bytes
SHA-256: c116db72edffcbf7c3a0637c8360fc5bab635a7f9f3545ccf729abecb952482a

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