Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84e13f018419c2a…

MALICIOUS

PDF

86.9 KB Created: 2021-03-22 09:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a23c2641e23efa27205f1c180d9a2b7 SHA-1: 57623f98d16dfe3db82e197315ee2123ac177fb3 SHA-256: d84e13f018419c2a16e65c873be95d0b6abd8ab4b22f8dd28fa8bd52b1f19048
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 'nipisod.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'enterprise risk management book pdf'. No scripts were extracted, but the PDF structure itself facilitated the malicious URL delivery.

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://nipisod.ru/award?keyword=enterprise+risk+management+book+pdf
    • https://cdn.sqhk.co/kululojilo/giagihc/my_tech_guy.pdf
    • https://cdn.sqhk.co/jixuvepabu/hhjbijx/gestion_d_une_entreprise_de_la_construction_jonquiere.pdf
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fd0f40241010.pdf
    • https://cdn.sqhk.co/pefisemise/ivQgdUj/amazon_assistant_app_deinstallieren_android.pdf
    • http://gagivukamuw.getenjoyment.net/anger_management_modules.pdf
    • https://cdn.sqhk.co/turanexode/fgjLhiz/29073831751.pdf
    • https://cdn.sqhk.co/temejikowewa/TCEF3gc/top_music_player_windows_10.pdf
    • https://cdn-cms.f-static.net/uploads/4375071/normal_60342959592e0.pdf
    • https://cdn.sqhk.co/pazaxefuma/hcEXiiS/ragdoll_battle_simulator_2_roblox.pdf
    • http://kodepovorivapi.mygamesonline.org/how_to_use_an_architectural_scale_ruler_1_8.pdf
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5ff8fc6cc703c.pdf
    • https://cdn-cms.f-static.net/uploads/4409992/normal_6023c6591880f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rubidokezive/cd_albums_free_online.pdf
    • https://uploads.strikinglycdn.com/files/80ac9677-31ad-4c6e-b6f4-90db2e9cd500/hunger_games_catching_fire_book_vs_movie.pdf
    • http://solugivewatewa.myartsonline.com/tumbuhan_gymnospermae.pdf
    • http://rujidafedisezu.atwebpages.com/major_causes_of_unemployment_in_the_philippines.pdf
    • https://uploads.strikinglycdn.com/files/8155c812-7e28-4095-9e3f-d1dab35c793d/combining_like_terms_calculator_math_papa.pdf
    • https://s3.amazonaws.com/tigewibejageju/can_cells_store_atp_why_or_why_not.pdf
    • http://xogijowag.onlinewebshop.net/22035154640.pdf
    • https://s3.amazonaws.com/nufidibodudulad/sony_dsc-p72_memory_stick_compatibility.pdf
    • https://uploads.strikinglycdn.com/files/f0f5b822-4338-4a8b-a494-86fb4871ce4a/retipogipez.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_off00011528.bin
809e4b72ef91ec6d12e1d5383db22a39e0bc06faa85098353206fd9f18803908		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11528 5492 bytes
font_01_sfnt_off000127bf.bin
456d2c985a80906fbb9eba384c01b0129fdafe9195e18174cec2da90801fa267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 11232 bytes

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