Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d15d726861970e6…

MALICIOUS

PDF

85.4 KB Created: 2021-04-24 17:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f855102dd59187eae03048f4fa31f0c0 SHA-1: 1b9d5314b1cd969613ed1bf96731836caa348700 SHA-256: 3d15d726861970e6d5b4e17b56392c41b18dd1c6b2c9e57b0aa4832636291198
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The presence of external URIs and the nature of the URLs indicate an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=whirlpool+heavy+duty+thin+twin+washer+not+working
    • http://gofadivus.mygamesonline.org/prentice_hall_biology_textbook_free.pdf
    • http://babusokojanog.sportsontheweb.net/57262588287.pdf
    • http://ruzazeruduzelu.22web.org/pukuzerisexexamox.pdf
    • http://tuwukadinem.mygamesonline.org/fusion_integrated_reading_and_writing_book_2.pdf
    • http://bikejesoxatelo.mygamesonline.org/journal_articles_business_administration.pdf
    • http://gedadekenoz.mywebcommunity.org/metabolismo_anaerobio_y_aerobio.pdf
    • http://xutifufaxe.mypressonline.com/importance_de_l_alphabtisation.pdf
    • http://tasenatalagotur.22web.org/virozofolodur.pdf
    • http://kesuvajeb.scienceontheweb.net/manual_for_canon_p170-dh_calculator.pdf
    • http://mazoxobiziwikut.iblogger.org/javascript_cheat_sheet_stanford.pdf
    • http://nalowisep.22web.org/51895016062.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zobuwijezad.onlinewebshop.net/90955888083.pdf
    • https://uploads.strikinglycdn.com/files/1e284776-1bf3-4800-bf0c-3ac3c033cb6c/54767426478.pdf
    • http://pegowalinasaduk.rf.gd/airtel_ng_data_plan_for_android.pdf
    • http://koxusaje.epizy.com/hp_officejet_pro_8600_plus_print_cartridge.pdf
    • https://uploads.strikinglycdn.com/files/6c319cfa-faa0-4bf3-8d22-1e8b1eff9726/54937133870.pdf
    • https://uploads.strikinglycdn.com/files/83d5e2f5-dd2d-4b4b-bc47-4c38dfc758c8/62795695897.pdf
    • http://sabuxixu.epizy.com/3d_apple_craft_template.pdf
    • http://mimumugemefes.epizy.com/annamalai_songs_unnikrishnan_free.pdf
    • http://galisatuvuvos.rf.gd/predator_4000_generator_parts_list.pdf
    • http://zalolod.epizy.com/articulos_cientificos_gratis.pdf
    • http://powagamojij.onlinewebshop.net/63475188175.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dbb.bin
c4a6c636f49b77ea0f9727b3695be2cd1f8ccafbbb049dfb5d39d980c117bea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 5552 bytes
font_01_sfnt_off000120b5.bin
6930ca77c450436a3c764db61c0e47c62a0e514ff1215cf25de090e2ac26491d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 11468 bytes

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