Malicious PDF — malware analysis report

Static analysis result for SHA-256 be40c2ebc1b4c2e9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-21 07:28:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b7065820c5800c90b919edd87362d4f SHA-1: 7b5d3ad1fc211ba0e5d0e082ce18283848054dd4 SHA-256: be40c2ebc1b4c2e9bb39a9810840d8b8c4cc25ebad2bea3a0dc5819943a9bc5a
96 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 an embedded URI pointing to 'vilenefex.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Adfly' and 'minecraft free', suggesting a lure to entice users to click the malicious link. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=adfly+minecraft+free
    • http://rozujed.sportsontheweb.net/jagelawaju.pdf
    • http://wulutapebime.getenjoyment.net/7086603685.pdf
    • http://fukiwurezopukof.mywebcommunity.org/texuduxowugipaxaxi.pdf
    • http://giocodigital.fun/walmart_tv_antenna_outdoor6ib8g.pdf
    • https://cdn.sqhk.co/xasurila/efggkhc/degedosujegazoboxepe.pdf
    • http://sibuvre.com/maplestory_reboot_kinesis_guidehcxsk.pdf
    • http://easterthjg.com/3776795878947u70.pdf
    • http://lawexape.mygamesonline.org/business_model_canvas_print.pdf
    • http://trynon.xyz/how_do_i_connect_my_logitech_k520_keyboard_to_my_computer0rrx0.pdf
    • http://namedaun.fun/4525419570hsmmj.pdf
    • https://cdn.sqhk.co/wokiwife/aCifhjq/free_ps4_games_playstation_plus_march.pdf
    • http://telgrm.site/4291770280988p26.pdf
    • https://cdn.sqhk.co/lojibuwe/Odwoibq/82599835812.pdf
    • http://arnautmebel.ru/71940609392sx9d1.pdf
    • https://cdn.sqhk.co/goduwonon/aaeaOfP/84697721693.pdf
    • https://cdn.sqhk.co/nixibaraje/hNsahjs/36327272725.pdf
    • http://rakapugijumub.sportsontheweb.net/tratados_de_libre_comercio_de_mexico_con_el_mundo.pdf
    • http://pafowitowa.medianewsonline.com/big_data_analytics_jntuh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lizuseguwix/franchising_vs_own_business.pdf
    • https://s3.amazonaws.com/bulikowexunepov/guided_reading_level_h_books.pdf
    • https://s3.amazonaws.com/nijudow/lonely_planet_guide_berlin.pdf
    • http://vebusatoro.atwebpages.com/oracle_pl_sql_tutorial_point.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_off0000f196.bin
f2cd429a3eef0130d94355c30d5198c47d917ba9e3e8654c64882f81ffeb3ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 5080 bytes
font_01_sfnt_off000102d4.bin
f8a1b0b4918ffe09b419da28fa22ddc926bb3ae79013bbeef7aa04d372ac87ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 11128 bytes