Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8d1d75875d0a6d…

MALICIOUS

PDF

71.2 KB Created: 2021-04-30 21:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abfc9d171dea3a21c0a5b542b1f7ff74 SHA-1: 7a59fe971d2b1f957a1b004d15b1acfab034554c SHA-256: ff8d1d75875d0a6d44649e39e192dce73a7c6febe5ceb949501f55289f6d2f16
136 Risk Score

Malware Insights

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

The PDF contains an algorithmically generated URL that points to a malicious PDF file, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious content.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://midufefew.ru/strik?utm_term=abuela+invents+the+zero+studysync+quiz+answers
    • http://mstmail.space/hillsongs_praise_and_worship_songs_playlist_2019n568v.pdf
    • https://cdn.sqhk.co/kozutani/cgdwBbk/19136431210.pdf
    • http://ru-1.casa/logitech_harmony_smart_control_remote_not_working5rc25.pdf
    • http://misulilexu.22web.org/pelalixudakukajebozig.pdf
    • https://cdn.sqhk.co/sofizagumup/jfuheih/sandwich_factory_poland_phone_number.pdf
    • http://nakidki-alkantara.xyz/solving_linear_equations_with_variables_on_both_sides_worksheet_with_answer_keyn46ko.pdf
    • http://razvivatel.blog/kulekiwijelifoduvalananzjsyj.pdf
    • http://privateguardingserviceagainstdanger.site/cours_excel_2007_complet_gratuitqzsbw.pdf
    • http://rodina38.ru/fimoxutenusedigacrh58.pdf
    • http://fc-aromat.ru/checkpoint_interview_questions_glassdoor7x566.pdf
    • http://gunasog.iblogger.org/95882497959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8177aa2d-1a03-46a0-a787-0450c9ae2806/the_circuit_francisco_jimenez_audio.pdf
    • https://uploads.strikinglycdn.com/files/d77ba183-0842-445c-bd9c-5a85479be4f0/54050642469.pdf
    • http://jizabimumonox.rf.gd/72853019529.pdf
    • https://uploads.strikinglycdn.com/files/920fa945-46bd-4000-a4c9-b32efd3344cd/witch_trials_bible_verse.pdf
    • http://repeputowuz.epizy.com/vargas_llosa_el_hablador.pdf
    • http://xifogufog.epizy.com/oxford_bookworms_stage_2_indir.pdf
    • http://zunuwovadete.epizy.com/xepevatawotasakimufedaba.pdf
    • http://lifosodutevofa.epizy.com/best_tablet_for_viewing_files.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddea.bin
160498e2a9eb98962f062eedbacd085ae631a4cc0b7c4a6590fea1f2890ec908		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 5584 bytes
font_01_sfnt_off0000f107.bin
48be3c27ef9a7156bdfc6e65a9c714c6c1075eb8cde296f7b461c8ebe53d6c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10352 bytes

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