Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d75415d246e5a1…

MALICIOUS

PDF

78.9 KB Created: 2021-04-06 07:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2c72e27ae07494f5bc33f3dc60ea3b63 SHA-1: 5fdbe37c740ee188f3242e6e5b089feeb627a9ea SHA-256: f4d75415d246e5a168f7bc606008d6226ccf40636f69aba2953bb3b3c08cea88
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software disguised as a browser update or extension. While no scripts were directly extracted, the presence of multiple external URLs and the nature of the lure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://druttle.ru/award?keyword=ubah+file+pdf+ke+jpg PDF link annotation
    • http://rowexusaje.mypressonline.com/centrales_solares.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fcc963242169.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/0c65739.pdfIn PDF document text
    • https://cdn.sqhk.co/dowusutitozi/ha1I5je/xelezegoxo.pdfIn PDF document text
    • https://lobekopaxukibo.weebly.com/uploads/1/3/1/4/131453735/5084353712ccd.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/5116094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_605040d64569c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_60225a0c47e56.pdfIn PDF document text
    • https://futiwoku.weebly.com/uploads/1/3/5/9/135957929/fulaxaxemazutegapez.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/64064406959.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/chd5je1/negujugitosoluxoxa.pdfIn PDF document text
    • https://pivubetipu.weebly.com/uploads/1/3/4/3/134328131/5725907.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/2699426.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/007246cb8868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fd5f5cb617f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_601c5c7e82028.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/aidS9ie/tonabajumadomejevovala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_604150e96a314.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/19299593836.pdfIn PDF document text
    • http://pimoxonevuwewax.atwebpages.com/mastering_blockchain_andreas.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://scripts.sil.org/OFLIn 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_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 5300 bytes
SHA-256: e4f60951272603b7bb5b34339bf369c513dc39a5d574f139f6a927a679ea9ba5
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 11500 bytes
SHA-256: aee772eb4a760c2245c5cac06ef2677de8a47aa0e1725750d89e955e9092646f
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16076 bytes
SHA-256: 9d161d6e34f835aff196e226d852edde4d65b072a4902c32411b177d8c29261e