Malicious PDF — malware analysis report

Static analysis result for SHA-256 2328683b7b139ce1…

MALICIOUS

PDF

79.1 KB Created: 2021-04-14 03:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2497c24bed6e53154e5a77ead273ff4 SHA-1: d2a9de7f2ae1c63b008f0f29659a534c52127c12 SHA-256: 2328683b7b139ce1e2cdd66fb26a07977e1d70f153156031d485e239bd96e2e2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting or unknown reputation sites, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates the document is a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=buzz+lightyear+battery+operated+car
    • http://faxusigeroles.sportsontheweb.net/pierce_college_english_101_syllabus.pdf
    • http://gepexoliv.medianewsonline.com/14873348122.pdf
    • http://fanexaxujuto.22web.org/uses_of_computer_in_education.pdf
    • https://cdn.sqhk.co/rixutixim/EFw3icY/nes_emulator_apk_android_2._3.pdf
    • https://cdn.sqhk.co/vibisidumes/4hgjfhk/pixel_drag_racing_career_stage_5.pdf
    • http://texewofe.22web.org/56774712055.pdf
    • https://cdn.sqhk.co/pasededi/bk8hdWG/oneplus_new_buds_leak.pdf
    • https://cdn.sqhk.co/sovajepuxe/i0Q3dra/nunalekokusuvepidawilinib.pdf
    • http://zanovekolasin.mywebcommunity.org/17859815897.pdf
    • http://xenalebosob.scienceontheweb.net/hp_4500_printer_not_printing_properly.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jokolonu.rf.gd/32124770343.pdf
    • http://xunudijumo.myartsonline.com/save_adobe_smaller_file_size.pdf
    • http://xisirajotijejuw.rf.gd/beelzebub_s_tales_to_his_grandson_1950.pdf
    • http://pizuzol.onlinewebshop.net/bsc_botany_notes.pdf
    • http://fojiresov.epizy.com/marriage_and_sexuality_in_islam_ghazali.pdf
    • http://vexabimumemig.atwebpages.com/changing_to_word_format.pdf
    • https://s3.amazonaws.com/dinisemowoge/46422237067.pdf
    • http://zagusax.rf.gd/vebatijopekebopupuzu.pdf
    • http://risakimo.epizy.com/notting_hill_carnival_route.pdf
    • http://gufopexolax.myartsonline.com/56694429015.pdf
    • http://takidodaw.rf.gd/nodomikijisawinitudax.pdf
    • http://niniraxezu.rf.gd/80641087647.pdf
    • https://s3.amazonaws.com/fifomi/guwib.pdf
    • https://s3.amazonaws.com/resisuna/air_force_one_movie_cast_duke.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_off0000f5f9.bin
d7d38cbc116f5c83fbc2e39631057741519fc20107e0ecfbc36e585897f93f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 5496 bytes
font_01_sfnt_off000108b1.bin
e9d203ca1c890d63e64bf7b366a046ae5f719340fadd4bf744d60eb8d20db34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 11180 bytes

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