Malicious PDF — malware analysis report

Static analysis result for SHA-256 f997a0aab96d0e49…

MALICIOUS

PDF

77.8 KB Created: 2021-03-30 07:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: adafdf84d54a988d7d23ade2139c70ee SHA-1: da0c73ffd099c3fa0089d698b61e4521d71cc8c1 SHA-256: f997a0aab96d0e4994b26bcf36afb39319d8fd019d89ac56696d43fb2924a130
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ML and ClamAV detections strongly indicate maliciousness, specifically classifying it as phishing/trojan. While no scripts were directly extracted, the PDF structure and embedded URI suggest an attempt to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

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://midufefew.ru/award?keyword=informative+article+example+pdf PDF link annotation
    • http://kulanefimolon.mypressonline.com/xerurogipor.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/61112803694.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/icdhejj/download_game_big_bang_evolution_mod_apk.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/88414700523.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/breakup_books.pdfIn PDF document text
    • https://cdn.sqhk.co/mofekuma/UhhqY5j/66145088866.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/7147af69-81e0-46d1-9dbf-b78a4c222b8b/foundation_trilogy_movie.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_accba02ebf5e40d0bb54421cbd425328.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_82c16b6b803a4eab946a43ca9a6f2af7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/how_to_cite_words_from_dictionary_in_word.pdfIn PDF document text
    • http://kigetivizaru.epizy.com/50296248344.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/edexcel_gcse_pe_revision_guide.pdfIn PDF document text
    • http://lepebelezoselob.rf.gd/commemorative_plaque_template.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_8af9f58837bb416b8d070fa1872a2a14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mixanaz/avaya_one_x_communicator_certificate_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b1a6d1-e1fa-454b-8aea-b719f55727f1/diary_of_a_wimpy_kid_movie_rating_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a2e32e-25b8-4de2-8066-d135567a7f41/sport_dog_shock_collar_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268924ec-052a-4f5d-8289-84403d457f4e/40696245177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63984f8-d008-40cc-a6fc-f9db5c8250a3/why_does_australia_have_unique_animals.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/83871804643.pdfIn PDF document text
    • http://migisunutejelu.rf.gd/bedixusikemixusekebida.pdfIn PDF document text
    • http://lurarapekakaka.atwebpages.com/nadiludukexet.pdfIn PDF document text
    • http://vegozamefokim.rf.gd/81356015539.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 5188 bytes
SHA-256: 17caf1188d92856250fc84e058496e81ad0d3d14d51d75aeb2e60420a481ae66
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 10820 bytes
SHA-256: 33492108c17a0ec668b7088078fa76d46d11bffa069ba7216ca060209a9782e3

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