Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1affe2e9736f83…

MALICIOUS

PDF

74.7 KB Created: 2021-03-12 18:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4d7c1383780d9c79c4bb316221c9db2 SHA-1: e51ff626c25cc203322efe6c7db74c2c00b0c36f SHA-256: 1a1affe2e9736f83b940c24295d7276669608119cd171dbc62b4079efeca4a1c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one pointing to 'nipisod.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to direct users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/wix?keyword=a+thousand+acres+chapter+summaries
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/a2b28b.pdf
    • http://raguvigawak.mypressonline.com/nixaremofokoxorerumugubu.pdf
    • http://sitebomobegux.sportsontheweb.net/how_to_make_phthalo_green_oil_paint.pdf
    • http://vixemifojetinag.sportsontheweb.net/how_to_use_a_hamilton_beach_roaster_oven.pdf
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/gibujepefuwazos-vivefus.pdf
    • http://gikodarekegov.mywebcommunity.org/arithmetic_progression_mcq.pdf
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/xasakejuvugonu-wizomikobileli-sixofozu.pdf
    • http://rinusiwujegabu.medianewsonline.com/35106716444.pdf
    • http://forovasax.medianewsonline.com/types_of_spelling_errors.pdf
    • http://pimifawimonidij.mywebcommunity.org/44116933700.pdf
    • http://tuwasukam.getenjoyment.net/fantastic_mr_fox_watch_online.pdf
    • https://zukixemafeka.weebly.com/uploads/1/3/1/3/131398149/553336.pdf
    • http://nesorus.mywebcommunity.org/how_long_is_a_one_pager.pdf
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/593f96b05e85fe8.pdf
    • https://roxeviviko.weebly.com/uploads/1/3/5/3/135317288/4189d43.pdf
    • https://pemogele.weebly.com/uploads/1/3/5/3/135324676/3161024.pdf
    • http://didazema.mypressonline.com/is_there_a_meteor_coming_tonight.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6738823f-222b-4241-88f4-74c7bd25b1e4/bemobigovitedu.pdf
    • http://nununad.myartsonline.com/game_of_thrones_download_in_tamilrockers.ws.pdf
    • http://sebokegekesuded.atwebpages.com/dell_inspiron_n5010_i3_4gb_ram_price_in_india.pdf
    • https://uploads.strikinglycdn.com/files/5dff5267-737a-461b-b4d6-8ba28405728b/2011_rav4_starting_problems.pdf
    • https://uploads.strikinglycdn.com/files/5550e3a2-c50d-45f2-9b4a-69f0a4daa514/machine_learning_data_science_and_deep_learning_with_python_free.pdf
    • http://letutemoxeluz.onlinewebshop.net/15429623632.pdf
    • https://uploads.strikinglycdn.com/files/2f5b4206-0c7c-4aa6-b6d8-74818a92c448/andrew_wommack_healing_is_here_2020.pdf
    • http://nivuzujanux.myartsonline.com/business_communication_definition_by_different_authors.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_off0000e774.bin
fbe6c74f029fa003a3c2bd75118bc08f8684a5afe0609ae566ff6a7be7a6ccbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 5272 bytes
font_01_sfnt_off0000f934.bin
73a690b5d7b2daf4873a67a24ef8ba7884125653166e142208fca1b9ef0b0b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 10824 bytes

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