Malicious PDF — malware analysis report

Static analysis result for SHA-256 a601379eb7309bc0…

MALICIOUS

PDF

79.4 KB Created: 2021-03-28 18:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf2df2828391e1d7882e9987ede82aac SHA-1: 31d7c7cb533d5bfa59eccfe4981eadabb9c995f1 SHA-256: a601379eb7309bc0b12e425ee6d971669192fbd0e63494343c95eacce57662fb
126 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=worksheet+congruent+triangles+sss+and+sas+answers
    • https://cdn.sqhk.co/sejejajoxej/ibHPJjc/golf_battle_rush_mode_apk.pdf
    • http://kirakexig.mypressonline.com/vegetarian_healthy_recipes.pdf
    • http://nakukamofo.22web.org/how_to_start_a_sports_complex_business.pdf
    • http://zagavexakagin.mypressonline.com/sahih_bukhari_free_download.pdf
    • http://zotolowowomeve.iblogger.org/function_of_psychiatric_social_work.pdf
    • http://tumibejum.iblogger.org/netflix_expired_meaning.pdf
    • http://dalifajebuxog.scienceontheweb.net/30341674285.pdf
    • http://jorowijedo.mywebcommunity.org/federal_court_holidays_2021_central_district_of_california.pdf
    • https://cdn.sqhk.co/burexewejam/ggrihji/socket_programming_in_java_server_client.pdf
    • https://cdn.sqhk.co/kapopajij/didiajj/78166776207.pdf
    • http://tanubujurutemut.scienceontheweb.net/rulepuxekubewidonate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vomoguzidazufi.rf.gd/graphic_design_portfolio_2020.pdf
    • http://rinonefor.rf.gd/non_verbal_reasoning_practice_questions.pdf
    • http://bofuwivazaja.rf.gd/lecciones_aprendidas_accidentes_de_trabajo.pdf
    • http://relurifiluxel.epizy.com/bcece_medical_certificate_format.pdf
    • http://duvodix.myartsonline.com/sesopedadakare.pdf
    • http://xatowumo.epizy.com/narotugaru.pdf
    • http://tenemiwufenapek.epizy.com/why_does_my_dyson_stick_vacuum_stop_and_start.pdf
    • http://wolobugoxew.myartsonline.com/73871905600.pdf
    • http://jagixav.rf.gd/84621879545.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc8.bin
39c63d7dbf189e831fa1c0b9360c0af2ae2cd0b07e7a001891758c2a6f72569e
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 5252 bytes
font_01_sfnt_off0000feb9.bin
75419891a128a0aa72cb5fb4765618942de19f8043dade7fa91b6aa47ed05865
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 10360 bytes
font_02_sfnt_off000121fe.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 4324 bytes