Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc4aa8618a0f5d8…

MALICIOUS

PDF

78.0 KB Created: 2021-05-04 13:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19f5ad87f780e995248d7f911ef94c1e SHA-1: 78cdc302d41e482d456bc202f6a13f62c4f07c71 SHA-256: 0fc4aa8618a0f5d8ecea7fcd1861ed5b8017f03bca49eac35268ff69c0fb6b04
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'kuzutuzo.ru', which is presented as a download link for the 'Oxford dictionary of English app free'. This suggests a social engineering tactic to trick users into downloading a malicious payload disguised as a legitimate application.

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://kuzutuzo.ru/strik?utm_term=oxford+dictionary+of+english+app+free
    • https://cdn-cms.f-static.net/uploads/4473030/normal_6015415cc59eb.pdf
    • https://cdn.sqhk.co/jojojidatun/hfjbRiZ/real_drift_max_car_racing_2019.pdf
    • https://cdn.sqhk.co/jebuxanit/uwidjej/sheet_music_for_jeopardy_theme_song.pdf
    • https://static.s123-cdn-static.com/uploads/4456369/normal_5fff519683092.pdf
    • https://cdn.sqhk.co/xerolunem/cKCZihm/inside_out_cast_voices.pdf
    • http://spencermcman.us/eventide_space_reverb_and_beyond4k2r9.pdf
    • http://revershjtb.site/92911366937ke6lq.pdf
    • http://laxana.ru/kotak_securities_account_closure_formgseqy.pdf
    • https://cdn.sqhk.co/wavagowew/ehiIifN/xexujeseromudivivilev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tugabijenovili/fios_router_g1100_specs.pdf
    • https://s3.amazonaws.com/nuxomigo/how_to_turn_on_heat_n_glo_pilot_light.pdf
    • https://s3.amazonaws.com/bagisi/best_atari_jaguar_emulator_for_android.pdf
    • https://s3.amazonaws.com/timituvupame/how_to_adjust_the_carburetor_on_a_stihl_bg86_blower.pdf
    • https://s3.amazonaws.com/xufaxoferugod/facebook_desktop_for_android_tablet.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/facebook_shortcut_for_mobile.pdf
    • https://s3.amazonaws.com/memexelu/81807039060.pdf
    • https://s3.amazonaws.com/bidemewufa/zaderatilufaviduxawijopup.pdf
    • https://s3.amazonaws.com/vukusa/motorola_talkabout_ms350r_manual_espaol.pdf
    • https://s3.amazonaws.com/jidosatikim/inventory_ageing_report_in_sap_s4_hana.pdf
    • https://s3.amazonaws.com/gumagabu/for_any_firm_what_is_the_long-run_average_cost_curve.pdf
    • https://s3.amazonaws.com/werowibovezoje/back_door_roth_conversion_tax_reform.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_off0000f21a.bin
1eabb1866d89ef8b3a462679b590812ffe18175e5cebf106bb86a56c26347dc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5616 bytes
font_01_sfnt_off00010546.bin
30ab452a6a18e95ccbbc225dd5b14d996582677f82b69490e31732cee2080d61
pdf-font-stream PDF embedded font (sfnt) at offset 0x10546 10920 bytes