Malicious PDF — malware analysis report

Static analysis result for SHA-256 343f5b9e1b476c6a…

MALICIOUS

PDF

80.4 KB Created: 2021-03-21 05:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4d7163a3e56da9f239f714ad3cdee86 SHA-1: 773a0e613098b65d4e249456720cf8c7d8deff5d SHA-256: 343f5b9e1b476c6a84ab70fef4e944b85ca6a7d7c0021f2d2abe9ed1c37522de
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to contain keywords related to the embedded URL, suggesting a phishing or malicious redirection attempt. No scripts were extracted, but the presence of a malicious URI is a strong indicator of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=jeep+bed+rack
    • http://fazejajogavu.medianewsonline.com/will_crib_sheets_fit_pack_n_play.pdf
    • https://cdn.sqhk.co/xamitarerivu/Ijdcifw/new_english_dj_song_audio_bhojpuri.pdf
    • http://digosige.mywebcommunity.org/jarobonog.pdf
    • http://gavolav.mywebcommunity.org/oxford_textbook_of_oncology_3rd_edition_free_download.pdf
    • https://cdn.sqhk.co/zelosoza/WiujiYi/tulipoxoz.pdf
    • http://vowujebotoza.mywebcommunity.org/spectra_s1_breast_pump_manual.pdf
    • https://cdn.sqhk.co/rosisole/Ojdjahb/tuwida.pdf
    • http://paxabak.mypressonline.com/exercise_34_frog_cardiovascular_physiology.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/simujix/email_invitation_free_template.pdf
    • http://mawokale.myartsonline.com/how_to_disassemble_a_graco_pack_and_play.pdf
    • https://uploads.strikinglycdn.com/files/46531465-b29f-448b-a64d-358553572cbe/never_marry_a_mexican_sparknotes.pdf
    • http://rukosivujuxu.atwebpages.com/gurujojoji.pdf
    • https://uploads.strikinglycdn.com/files/bedd02d0-7c88-4cd4-9103-540959655b39/how_many_books_are_in_the_bluford_high_series.pdf
    • https://s3.amazonaws.com/dezajok/coax_cable_spec_sheet.pdf
    • https://s3.amazonaws.com/vibuvomomuv/limiting_adjectives_worksheet_with_answers.pdf
    • https://s3.amazonaws.com/pokorevalaxex/56748109326.pdf
    • http://zutaturusix.myartsonline.com/34327720974.pdf
    • https://uploads.strikinglycdn.com/files/73b68aca-aa70-4428-a843-00a3c93d86de/furigutavikezadutozit.pdf
    • https://s3.amazonaws.com/jejulurowev/xosufijutemelepunibejez.pdf
    • http://refusunono.onlinewebshop.net/89918687670.pdf
    • http://jalijoruki.atwebpages.com/stanley_jumpit_1000_not_charging.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_off0000fbae.bin
f56c8a253232c819a9dec9da66fb400375ba8490797b33a863a1d4eadba4ea24
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 5048 bytes
font_01_sfnt_off00010ce6.bin
9446deb91394cf565ca41c22b08ccfa89e7c6e29cdc6be21fc5e9d471a4c7418
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 11176 bytes