Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b81083c8e92819…

MALICIOUS

PDF

90.7 KB Created: 2021-05-06 22:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0c60cce5705c9e7e659391f4a0b9067d SHA-1: ef5afb189d06346fa7c86c9f6c8be193dcc02179 SHA-256: d9b81083c8e92819bda398837361e83fc1a0d8b1af5363375f4953d3bc7a8610
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is a potential phishing or SEO spam lure related to a movie title. The PDF structure and embedded links suggest an attempt to drive traffic to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/strik?utm_term=is+there+going+to+be+a+shatter+me+movie PDF link annotation
    • http://kagaromorin.medianewsonline.com/synchronous_and_asynchronous_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/HlhhXij/play_chess_and_earn_real_money.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366346/normal_5ffe8948eac84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_600b64378911e.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/hgghhh7/bufuxixupop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_603c0a2b4b687.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/ii8CjbR/ding_tea_locations_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_e5a922edd93b4d5a9b6c1ca0700eb683.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1356414-d174-4072-b278-222e43834a7a/penotowoketilom.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_abcfc5dd66a748e3a947d258c8c81221.pdf?index=trueIn PDF document text
    • http://zasuwunal.myartsonline.com/classic_human_anatomy_in_motion.pdfIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_fbe8af26a7e744e6bd577f4767e79022.pdf?index=trueIn PDF document text
    • http://muwuvago.atwebpages.com/design_methods_and_analysis_of_algorithms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c72a5e-258f-44da-934b-477fa20227fd/how_many_quarts_of_oil_does_a_2012_toyota_highlander_take.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_505c2aa795db4863aa7cca3bd9eac0e5.pdf?index=trueIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_2b1920222848427c848594bf75836a63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0983e05-28fb-4a7b-a8e3-0950e270dcfd/89839088281.pdfIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 5204 bytes
SHA-256: eafc359f12da35dfd92c34a946b3702106ec32e5db23d319ce01b5681bef8d7f
font_02_sfnt_off0001117c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 2252 bytes
SHA-256: aeee9b2fd577c594ede074a7e3493832e024aab8d381a7c1d16527c2e435dd06
font_03_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 12828 bytes
SHA-256: 2cbda6d4f6158626d0ae03f0ad1c368bb653f92e502e1a3b41c01e37ab8aa557
font_04_sfnt_off0001460c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460C 16060 bytes
SHA-256: e02432191d952bf4ca0be4cfeafc10308785ce9d9f3781c3262e4e8a73b31f63

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