Malicious PDF — malware analysis report

Static analysis result for SHA-256 04830fcd68f7b00b…

MALICIOUS

PDF

79.7 KB Created: 2021-03-25 07:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ee6bbd4a39e354b3868369b4ae007b8a SHA-1: de60de05cdd7d65004ead243e310b8e960d7abae SHA-256: 04830fcd68f7b00b72ea3a9e5a0e5f342ec6bbd4269cc1cbe6475d8dbb3ab1fe
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content. No scripts were extracted, but the PDF structure itself is designed to funnel users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://crophysi.ru/award?keyword=before+i+go+to+sleep+full+book+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5ff6aeda1fd52.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/domegaripe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_5fd3ca16278ac.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/MVajbgh/29338456150.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/pumiko.pdfIn PDF document text
    • https://cdn.sqhk.co/zibepidok/icIChid/mars_weather_radar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_602183a160b69.pdfIn PDF document text
    • https://cdn.sqhk.co/zilidadakole/7JMFjiS/rijakulikejufogik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411501/normal_5ffc2bb4786b5.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/abidiaC/easy_cake_recipes_for_beginners_without_baking_powder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427544/normal_5febe320aa3c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5fe3dd0dbec23.pdfIn PDF document text
    • https://susatabunek.weebly.com/uploads/1/3/2/6/132695662/6642508.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/bbQusfB/make_a_list_of_prime_numbers_python.pdfIn PDF document text
    • https://gitefitibed.weebly.com/uploads/1/3/5/9/135968717/230778.pdfIn PDF document text
    • https://sojuseruk.weebly.com/uploads/1/3/4/3/134367588/95ffb74ef341737.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/fjbYggr/41836666918.pdfIn PDF document text
    • https://cdn.sqhk.co/kipaselofuza/wiiYmid/radiant_heat_manifold_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/jdZjiQc/94821001462.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/caTiaic/network_marketing_companies_for_guys.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_6053007f7fc9c.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb90ca4e-50e6-4755-a69c-d0c182cd9511/52334293802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d73064-8f4b-4c7b-aa7d-4968e3e69201/easy_guitar_riffs_for_beginners_acoustic_youtube.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 5252 bytes
SHA-256: b88a59359d2c8838fcaa0db3fc19df235b884a03847024a83b892ed302e806c7
font_01_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 10360 bytes
SHA-256: 9eca5972fffcaac56cfefdae74093a5ae382594df292895d20bc79e310aa2c46