Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8d6eafc53d0746…

MALICIOUS

PDF

92.9 KB Created: 2021-04-02 11:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 940d152febf35789d2aafb4e355e1526 SHA-1: f94e030ca66a09a3b8dc899363c91fe61c166871 SHA-256: 0a8d6eafc53d0746c9723941025b6bfd38f135564f34b7c12029916867a1aa61
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a payload or visiting a phishing site. The document body, though heavily obfuscated, appears to reference educational content, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=electron+configuration+aufbau+principle+worksheet+answers
    • https://cdn.sqhk.co/ludibipimilu/gljhjeQ/word_family_oxford_english_dictionary.pdf
    • https://cdn.sqhk.co/fodexuxefeba/7hemYnU/word_cookie_answers_onion_2.pdf
    • https://cdn.sqhk.co/pepupiribojo/pigihgg/new_status_video_download_2020_mp4_sharechat.pdf
    • https://cdn.sqhk.co/bogovureg/dKgfjeo/king_tommen_game_of_thrones_actor.pdf
    • https://cdn.sqhk.co/moxoxitij/fhhihgf/apocalypse_cow_game.pdf
    • https://cdn.sqhk.co/bomagomax/hdjdjgx/start_em_sit_em_week_1_2020_wr.pdf
    • https://cdn.sqhk.co/nomavunut/2wv7nRd/mobile_weather_radar_15.pdf
    • http://fruittea.space/idle_miner_billionaire_seasonv85ie.pdf
    • http://foodguideblog.com/broadcast_journalism_books0av0q.pdf
    • https://cdn.sqhk.co/nazabimon/gcqjecJ/define_diaphoretic_medical_terms.pdf
    • http://fruit-ital.space/shows_to_watch_if_you_like_big_little_lies2bo3u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jivamubug/ajax_post_body_form-_data.pdf
    • https://s3.amazonaws.com/fonibinaraj/gajijinovezojudosileki.pdf
    • https://s3.amazonaws.com/rurovikejigibu/13690215128.pdf
    • https://s3.amazonaws.com/pafexegud/junie_b_jones_first_grader_series.pdf
    • https://s3.amazonaws.com/dejazuvorira/19625832498.pdf
    • https://uploads.strikinglycdn.com/files/29605f23-a8ce-4f1a-bae4-008eadc477a2/red_rising_book_6_2020.pdf
    • https://uploads.strikinglycdn.com/files/488faaea-a23a-45c6-94e1-a00ef222b506/bewub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d29.bin
e81b9096102d8c25bcbe4fc07074990bd1c189e6bad9ea47293e31e942faefc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 5412 bytes
font_01_sfnt_off00012f9f.bin
7cf803ffe2fb1de652b304b2e969732a36fa7a08fabdbeafa7a9f1601c807a0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 11852 bytes
font_02_sfnt_off00015780.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15780 4324 bytes