Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bb2496b9b6a58e…

MALICIOUS

PDF

126.8 KB Created: 2021-03-15 03:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 00b870f9da90a4282208a60f97ee50b4 SHA-1: 4f09a93c97662eb93f56940cd74026b6f5330007 SHA-256: c5bb2496b9b6a58e39fa58289bda4441c258e2ce094cf4b8148752b5db131a71
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains an embedded URL pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The PDF's content, though heavily obfuscated in the provided excerpt, is associated with a medical scale, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=fugl+meyer+upper+extremity+scale+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447093/normal_600513eb2f17e.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/67354061625.pdfIn PDF document text
    • http://manamuketamas.22web.org/cathedral_of_brasilia_architecture.pdfIn PDF document text
    • http://uber-global.com/85118870584lgi9.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/fimiparukusatenofi.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/pride_and_prejudice_full_movie_online_with_subtitles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_601e331c90aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_602faf188f353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425728/normal_5fe0470fadb4a.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/minolta_maxxum_7000i_sd_card.pdfIn PDF document text
    • http://my-credit.info/manufacturing_planning_and_control_for_supply_chain_management_6th_edition_downloadov9ht.pdfIn PDF document text
    • http://purpless.vip/download_game_tactical_battle_simulator_mod_apk2n12k.pdfIn PDF document text
    • http://tehnopolis.org/is_counting_by_sevens_a_moviejwllj.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/voratudadumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd4e70d-bc61-438b-ae57-75f38544535e/24157785158.pdfIn PDF document text
    • http://luzavevamafidix.epizy.com/science_of_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725abd37-5149-4101-ac8a-35135654ef70/fitunofizopo.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_b7764cb150664eb996c61c6cc71c99f7.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_3c95e80276ac480b931eb36a5fa17a6c.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_b79dce5677b545ce87c0cd062872d65b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf64215b-1768-4a62-a59b-0abef88c4ed7/call_of_duty_black_ops_2_save_editor_xbox_360_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6341ad-53f2-404d-ae69-c1c8215d1064/ibn_kathir_the_beginning_and_the_end.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1b67f9-1923-413d-82e1-9906faf9e086/95497299600.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_ff381babb68848e299429848cb9ce6d0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2B0 5600 bytes
SHA-256: f367bbe586bee51638bac55fb6239b816f0348cd1ae9bc08a5f8a77b2cc7352e
font_01_sfnt_off0001c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5C9 11596 bytes
SHA-256: 79b21cf89b0ff1305717ea8711516920022ee6f1be62b6e3ead2e86a26c88b4d