Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc390a3ca0cb37e…

MALICIOUS

PDF

89.9 KB Created: 2021-04-03 20:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17f55285a1c408c2684e7b15d689aeab SHA-1: e254ca9982d40b6dec9b764cfd6bf0824d56b3cb SHA-256: adc390a3ca0cb37ed90304677b0868538b6d9df329eb3a139f280d13cd09311c
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 URL pointing to a suspicious domain, likely intended to trick the user into downloading further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'classroom objects worksheets for first grade pdf'.

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://botokaw.ru/award?keyword=classroom+objects+worksheets+for+first+grade+pdf
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/3169201.pdf
    • https://suxobiras.weebly.com/uploads/1/3/4/6/134614615/8463290.pdf
    • http://puzososiv.22web.org/aadhaar_update_form_online.pdf
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/1926114.pdf
    • https://cdn.sqhk.co/norasoketika/c6zbacg/sponge_granny_scary_yellow_mod_horror_gamemode.pdf
    • https://cdn.sqhk.co/valipovu/ahigfha/2d_strike_mod_apk_5._9._3.pdf
    • http://faxagigotitij.66ghz.com/rational_choice_in_an_uncertain_world_free_download.pdf
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/givifudarojetazafim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zisulamisozoto/53472572079.pdf
    • https://uploads.strikinglycdn.com/files/d67f9891-0e9f-48ec-a39b-c319901d916d/zazudeja.pdf
    • https://s3.amazonaws.com/jokotaziweluge/78233594084.pdf
    • http://fivamoxopel.epizy.com/sefekav.pdf
    • https://uploads.strikinglycdn.com/files/e102f2e6-a2c2-4f2d-93b5-644543168743/watts_premier_hot_water_recirculation_pump_installation.pdf
    • http://masemipeba.myartsonline.com/78776634622.pdf
    • https://s3.amazonaws.com/mamukawaxatali/where_does_steam_workshop_mods.pdf
    • https://s3.amazonaws.com/penale/5271979262.pdf
    • https://uploads.strikinglycdn.com/files/b83392a2-71de-4932-b629-0c44fd106711/normal_arterial_blood_gas_values_newborn.pdf
    • http://gafodix.myartsonline.com/dukes_anesthesia_secrets.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_off000113f1.bin
3989d7565cfd6eef634d389c8ea07949f1ad6286b4e00afd017f15994b582cd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 5648 bytes
font_01_sfnt_off00012743.bin
b82744b7439e5d45a3540f6f1100c28c22844cc6712f71860e9e2026ef0a6fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 10772 bytes
font_02_sfnt_off00014c04.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C04 4324 bytes