Malicious PDF — malware analysis report

Static analysis result for SHA-256 326db835c9f5dd02…

MALICIOUS

PDF

71.7 KB Created: 2021-02-11 15:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5734b5c1ccb4a0aa5d47a58000de480f SHA-1: 01e2c4e6c5eca700cd1e6fa0e85ce6675e679f27 SHA-256: 326db835c9f5dd0273e4206b66199700f4713cbdadb9b7ef0519f1e9939eea71
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a machine learning model indicating high maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The numerous embedded URLs point to a link farm strategy, likely designed to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/wb?keyword=metformin%20pregnancy%20category%20b In PDF document text
    • https://cdn.sqhk.co/mewivupa/gjcgcfH/car_panic_alarm_sound.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fd2c91a2c1ec.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/jdXVgef/persona_5_homeroom_teacher.pdfIn PDF document text
    • https://sixudamitewugu.weebly.com/uploads/1/3/5/3/135327289/pedazef.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/hjaOgfm/10130280246.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/software_to_facebook_videos_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xatijafuwami/dRlo0wq/79540685619.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/faduwud-wesimuve-pumixalulamoluv.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/Dsidsz6/champions_manager_mobasaka_2020_new_football_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370307/normal_5ff9e05a9ded0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457604/normal_600ae713f0590.pdfIn PDF document text
    • http://vixurefivero.66ghz.com/63049466862.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujelagikajuju.rf.gd/serixexifesufavodajaro.pdfIn PDF document text
    • http://fevenubonanez.rf.gd/latimitafixipi.pdfIn PDF document text
    • http://xatosizukav.epizy.com/56861877324.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 5372 bytes
SHA-256: 8f2c6325e0055a41593117cf264b70a38fbddb3e7c88f8a7b47e45d68428c5bd
font_01_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 10700 bytes
SHA-256: 1911e7ae5a6792d0efb40d73b650275cf74b94e879804bb51bf99c450f946a97

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