Malicious PDF — malware analysis report

Static analysis result for SHA-256 17421cd08d41a8f7…

MALICIOUS

PDF

93.7 KB Created: 2021-02-22 17:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e8e9b7d312b95e3bf03e86792194d5a6 SHA-1: 48d64e35c22247b446aa1227b76d4d1f363629d7 SHA-256: 17421cd08d41a8f74c94b738a7711807b2be365baea71da86eaaecd08f089f2f
174 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing malicious software by posing as a necessary browser update or viewer. The presence of numerous external URLs, including one pointing to 'leonvi.ru', further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall context points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://leonvi.ru/123?utm_term=autocad+3d+max+viewer PDF link annotation
    • https://cdn.sqhk.co/nomitusibop/hg1ihKT/dizomobibi.pdfIn PDF document text
    • https://cdn.sqhk.co/rusefijow/fWuifhc/harkins_theatres_northfield_18_northfield_boulevard_denver_co.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5ff6909f840ed.pdfIn PDF document text
    • http://vukabakoxipus.22web.org/viloviwebukepej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_602905a9319ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_601d07a86d22f.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/6hjibih/8_bit_game_maker_pc.pdfIn PDF document text
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/9424088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_602d61879860a.pdfIn PDF document text
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/3332089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kudowo/ejercicios_categorias_gramaticales_1_eso.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/delesavibetewibupiwim.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/cakra_khan_kekasih_bayang.pdfIn PDF document text
    • http://zozadugaweguj.epizy.com/company_core_data_sheet_ccds_template.pdfIn PDF document text
    • http://vimiromomekex.epizy.com/82066990534.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_off00011b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B47 5248 bytes
SHA-256: b010f7f2998e11ca44a5760b29bb3318f1496c80988131fbf44fcb129ffdc853
font_01_sfnt_off00012d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 11396 bytes
SHA-256: dccf313b4ebfef577674282cce8d9670abf5cc21a24848b867435ca93ccf4f7b
font_02_sfnt_off00015485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15485 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3

Open this report in the interactive analyzer, or submit your own file for analysis.