Malicious PDF — malware analysis report

Static analysis result for SHA-256 400bfad3d3e9366b…

MALICIOUS

PDF

72.2 KB Created: 2021-03-16 21:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 32b0ae0a2efb414beb08e5a255f58e66 SHA-1: 95c1149ed32bf83ca71a4db1bbedfbbe38001604 SHA-256: 400bfad3d3e9366b2c8961d3cfa5801bfb307d284f0870253d87555050b6d0b3
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded URIs are consistent with attempts to redirect users to malicious content.

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://lozipotod.ru/award?keyword=plural+possessive+worksheet+pdf PDF link annotation
    • http://trastenmyqort.online/13940839281b9e2i.pdfIn PDF document text
    • http://karnaval.host/colours_that_go_well_together_with_blackfts76.pdfIn PDF document text
    • https://cdn.sqhk.co/gafazakedoki/hiicB9w/twitter_video_chrome.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/16113156396.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/Okvvwjg/payment_slip_for_form_mn1.pdfIn PDF document text
    • http://sumomubidisuwo.iblogger.org/cdc_hemodialysis_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_601f833a81200.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/new_rental_laws_in_california_2019.pdfIn PDF document text
    • http://giocodigital.space/frontiers_in_molecular_neuroscience_author_guidelinesysip4.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/aGic39I/bollywood_box_office_class_of_83.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/heath_zenith_motion_sensor_light_wont_turn_off.pdfIn PDF document text
    • http://normal-id.com/resumen_del_mito_de_las_cavernas_de_platon0d4bi.pdfIn PDF document text
    • http://xbet1.fun/62700695876mc92z.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/94123044897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_603d562499792.pdfIn PDF document text
    • https://cdn.sqhk.co/nozisaxa/bRojbpW/biomedical_informatics_university_of_pittsburgh.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/26b5e9a4-6d59-4cd9-946a-663aee4e5f3e/tavuguzomu.pdfIn PDF document text
    • http://botalibinizor.rf.gd/chorale_from_jupiter_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652757d4-7b2d-4ff6-acc4-b819b14dac1d/correlation_between_gdp_and_standard_of_living.pdfIn PDF document text
    • http://kovuzamizin.rf.gd/muvevukasox.pdfIn PDF document text
    • http://lakelasu.rf.gd/how_to_unlock_android_13_xenoverse_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0a640f-10a8-4761-b563-fc8690e4ecea/nuvew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c03973-e712-433f-bfa5-2ef2d5bc1e9e/is_capital_expenditure_capitalized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379164f6-66c9-41ad-a64b-e33b0ddd1582/61293124482.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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 5344 bytes
SHA-256: 66b6a76a981330af5d618f0df63ea54077ea5f8646b9bdf3dd9e80d706896ca0
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 10924 bytes
SHA-256: 1e6b56750d575186285b6b6d46172d3e34947b64fa1f86fefe09efc73067ebbd

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