Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab941f9f7c0069d…

MALICIOUS

PDF

76.8 KB Created: 2021-04-15 02:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f0bde1e5b4529db5565d54a4473049ca SHA-1: 0468fb7c5804dfa929adfd0edbea6c5d5291b0c8 SHA-256: aab941f9f7c0069db3f2c04d6eca053584671c44a510d16939a90822a673844e
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=verizon+ont+i-211m-l+ethernet PDF link annotation
    • http://winclean-shop.space/2472994901qeiza.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/ap_budget_2020_20_in_telugu.pdfIn PDF document text
    • http://fitness1.space/how_to_connect_ge_smart_dimmer_to_alexawhbv8.pdfIn PDF document text
    • http://misujupino.getenjoyment.net/how_to_make_an_easy_origami_paper_airplane.pdfIn PDF document text
    • http://onlinekartiadesi.com/joseph_prince_sermons_notes4d8ag.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/adobe_photoshop_tutorials_for_beginners_2019.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/funcionamiento_de_motor_electrico_de_corriente_continua.pdfIn PDF document text
    • http://takovevagagiv.scienceontheweb.net/37790730955.pdfIn PDF document text
    • http://paxenazubenib.mygamesonline.org/ignou_assignment_front_page_download_2020_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fadobirak/officer_buckle_and_gloria_activities_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4c2e98-448e-4f29-bb09-12536f508763/5_conversiones_de_miligramos_a_gramos.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_e1ecce004eb7459aa26fd5681b04e187.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/883639d8-86b9-4eed-81a7-23c9b9be9769/git_bash_script_example_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/xavexuxelofim.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_9fa19e0409784fd29794296cc44a5a03.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/data_scientist_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3486b15-d447-41c0-8ffe-4f21575fca99/varavitezufitabuladosev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d3f5b9-06c2-4fd8-81f5-238815364575/janajepabeti.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_772d5c3b8c84457a85f38a54a55cfd99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/rutezoravarununep.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/winefis.pdfIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_9f48900e7f954fd996894b301f9faa42.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_593fe44795a347c8820842289c6eb6b5.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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 4768 bytes
SHA-256: 0ec4170d7e270f13b62a864d5385e08eb12e30811b7629f42fc4030799acf6d8
font_01_sfnt_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 10824 bytes
SHA-256: 83b2457744c6903c08f8b68f41a7ca9b2ae798bf73770be83ac55d9a73e9cc00