Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a1cae3ed386556…

MALICIOUS

PDF

85.2 KB Created: 2021-04-08 09:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9868b89a182aa0622ffcfe8765c358b SHA-1: bbf9a6b19c915532726d6fd01ef19b8df36cdc4c SHA-256: 58a1cae3ed3865564ff232c575dcae2fbd148c41fda2d75f7aa4d7b2a7324994
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a technical topic, which is a common lure for phishing attacks.

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://vilenefex.ru/strik?utm_term=what+is+principal+stress+in+strength+of+materials
    • http://nudistoff.club/sapixilumalofelabiy5535.pdf
    • https://cdn.sqhk.co/mumesimasozo/uhcHshc/virus_cleaner-_antivirus_phone_clean_boost_mastercard.pdf
    • https://cdn.sqhk.co/libegavezu/hbihha6/rummikub_joker_replacement_rules.pdf
    • https://cdn.sqhk.co/xarozowuzosa/fRhb9if/weedmaps_find_marijuana_cannabis_weed_reviews_cbd_oil.pdf
    • http://ontrade.top/the_vegetables_we_eatt2vek.pdf
    • https://cdn.sqhk.co/suwuwewazaka/e0jiaFZ/zapabizajojugenupolaguzu.pdf
    • https://cdn.sqhk.co/ravusigi/hfQVGDy/10545866088.pdf
    • https://cdn.sqhk.co/kutagigixef/pglExMN/poxaximubej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/594e54c6-04eb-4e53-8679-34b9e6692491/using_angle_relationships_to_find_angle_measures_worksheet_answers_geometry.pdf
    • http://bupozefi.epizy.com/does_netflix_have_american_history_x.pdf
    • https://s3.amazonaws.com/dazovosugev/57074904975.pdf
    • https://uploads.strikinglycdn.com/files/ecd3d7c8-609d-4359-8762-abd474ba7765/kojejelusezadigu.pdf
    • https://s3.amazonaws.com/sefiwegegagu/what_is_the_main_theme_of_after_twenty_years.pdf
    • https://s3.amazonaws.com/gisujubolidine/birds_ambience_sound_effect_free.pdf
    • http://gikikojumikobep.epizy.com/high_probable_japanese_candlestick_patterns.pdf
    • https://uploads.strikinglycdn.com/files/1e123f9f-f477-441f-912b-6ab9373beb66/msi_z97_gaming_7_cpu_compatibility.pdf
    • https://uploads.strikinglycdn.com/files/b7a3a1a7-ea16-41aa-841e-ef4e90c20ce2/tipos_de_grupos_psicologia_social.pdf
    • http://lulevewutowa.epizy.com/ktm_bike_game_mod_apk.pdf
    • http://tapanowi.epizy.com/avatar_full_hd_movie_filmywap.pdf
    • http://sefatefa.epizy.com/htc_beats_audio_apk_no_root.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_off00010c33.bin
ba0ef8e065939f5c0574043b16d0add7e1a1ecb7de415972ee6469b5cbcc7560
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 5444 bytes
font_01_sfnt_off00011e9d.bin
c1610cf8f6988699cbc77ac419b4f6ed9944b704ced1b70df4c1c05d789082d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 11896 bytes