Malicious PDF — malware analysis report

Static analysis result for SHA-256 438fedfa25de7cb6…

MALICIOUS

PDF

83.5 KB Created: 2021-06-04 12:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3dac1061cdde85a970a8386dbd288d SHA-1: 960c73dd269d4cc13a263e94b1a8cdbceae2edfb SHA-256: 438fedfa25de7cb6162731014fe08b0db85e0621ce30a85d817cdef4ce3a0ed0
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, disguised as a search result for earbuds. ClamAV detected this file as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it as malicious with high confidence. The presence of multiple external URIs and a link farm heuristic further supports a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=best+budget+bluetooth+earbuds+for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pinurakus.pbworks.com/w/file/fetch/144532707/what_is_the_source_of_ammonia_in_nitrogen_in_water.pdf
    • http://pefumugat.pbworks.com/w/file/fetch/144593790/air_pollution_control_a_design_approach_4th_edition_free.pdf
    • https://uploads.strikinglycdn.com/files/cbca952a-d2cb-45f5-a7e4-df913c71ef14/the_outsider_albert_camus_chapter_1_summary.pdf
    • http://gosirata.pbworks.com/f/27009015058.pdf
    • http://nilanom.pbworks.com/w/file/fetch/144585144/la_petite_poule_qui_voulait_voir_la_mer_questions_ce1.pdf
    • http://xugilip.pbworks.com/w/file/fetch/144557964/57257320555.pdf
    • http://luwivaj.pbworks.com/f/driving_license_exam_download.pdf
    • http://redelaw.pbworks.com/w/file/fetch/144553341/how_to_measure_inner_diameter_using_vernier_caliper.pdf
    • http://tozuxexap.pbworks.com/w/file/fetch/144517530/zavuxewukolu.pdf
    • http://garigor.pbworks.com/f/40376545741.pdf
    • http://gozuwef.pbworks.com/f/hiring_tm_mantra_pronunciation.pdf
    • http://kivupored.pbworks.com/f/why_is_my_greenworks_pressure_washer_not_working.pdf
    • https://uploads.strikinglycdn.com/files/3b02eadc-2d0f-47b9-8fca-f5348a793edf/how_do_i_read_my_american_standard_ac_model_number.pdf
    • http://barumena.pbworks.com/f/what_does_mild_pulmonary_congestion_mean.pdf
    • http://kedetuwi.pbworks.com/w/file/fetch/144419445/bootable_usb_not_detected_macbook_pro.pdf
    • https://uploads.strikinglycdn.com/files/dcbb5afb-f16e-4e80-9920-e17ecd41e0d5/venexufanubakudevunop.pdf
    • https://uploads.strikinglycdn.com/files/2080b9ed-14f6-40e6-b094-4fb0e570e57f/50558444041.pdf
    • http://midevodimu.pbworks.com/f/vujajedavovajiporudume.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_off00010745.bin
9af1b336f0d000f11718677d8a63831045cdd62cc761365fb204edcebdd438ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10745 5356 bytes
font_01_sfnt_off00011971.bin
e30354422c32d35b6a7cad42d9431e69b6465aa99e8ce597dac57c0f97266ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 11148 bytes

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