Malicious PDF — malware analysis report

Static analysis result for SHA-256 62391393aae2f9dc…

MALICIOUS

PDF

75.5 KB Created: 2021-05-15 14:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8b87f05e2e51ceec283357b8c949c802 SHA-1: 15f8b7a1ebee574632cc19abf832121656dd3812 SHA-256: 62391393aae2f9dcf287891fa558acc505ca40b6811f854f8491d54afa67de9a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. One notable URL, 'https://baarspo.ru/strik?utm_term=what+is+slam+poetry+video', appears to be the primary lure, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=what+is+slam+poetry+video PDF link annotation
    • http://rijexofugovu.medianewsonline.com/80010155510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379732/normal_5fe1299b74d8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_60463ce287521.pdfIn PDF document text
    • http://xofezibukironex.iblogger.org/80750542705.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/milobizad.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/39716048396.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/GiisfHv/pick_pencil_case.pdfIn PDF document text
    • https://cdn.sqhk.co/xapanularopu/gdieifq/scottish_palliative_care_guidelines_2018.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/2951641833.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/amabili_resti_download.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/Xig0dsl/budget_template_for_graduate_student.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/1725251703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_6069d86342b51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • http://fazobelo.onlinewebshop.net/blank_map_of_the_world_continents.pdfIn PDF document text
    • http://pagitewuzowika.epizy.com/coreldraw_x8_with_serial_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pubopelej/black_lyrics_status.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/mathematics_book_grade_12.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/bimaxafetudawulupuriwaw.pdfIn PDF document text
    • http://suronatuxi.rf.gd/nusif.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/rheem_electric_domestic_water_heater_manual.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 5376 bytes
SHA-256: f2f309e6ca9fd0c3cae6bd5a5645daea6deb2d0ab1675b169938fba878007b06
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 10844 bytes
SHA-256: 786300dd4a0a3ad82d05ef4503886ddf12b57b8ca2087cc5cbfab17407bdf12c

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