Malicious PDF — malware analysis report

Static analysis result for SHA-256 756494b28aeb9270…

MALICIOUS

PDF

84.2 KB Created: 2021-03-18 08:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7b14c510511057793ede04242c98533a SHA-1: 58388febed5843edd682380418a99e8f108b9cb6 SHA-256: 756494b28aeb9270b1e6bd3b39668e48bab398abfe49e84b5945cf33b4f383d8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=export+datatable+to+excel+sheet+in+c%2523 PDF link annotation
    • http://fakexexu.sportsontheweb.net/how_is_energy_and_matter_transferred_in_an_ecosystem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_600efae186390.pdfIn PDF document text
    • http://rezubodojel.medianewsonline.com/rozovad.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/keto_diet_menu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fff47f859a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_6010024d49261.pdfIn PDF document text
    • http://jekenufakewe.mypressonline.com/simokosewavako.pdfIn PDF document text
    • http://sonoxusa.iblogger.org/convert_photo_to_painting_ipad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fd067eed8831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490125/normal_60473086af47d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0ec096ed-3c40-4db6-9907-518098e7b75a/lean_software_development_agile_methodology.pdfIn PDF document text
    • http://tezebidurob.epizy.com/jidunusi.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/introduction_to_data_science_in_python_week_1_quiz_answers_coursera.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/what_does_yes_and_mean_in_theatre.pdfIn PDF document text
    • http://lexawelezalum.epizy.com/guduj.pdfIn PDF document text
    • http://gefuxexo.epizy.com/8387489041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cb41219-c309-4869-99a5-70b3fcf4a534/36766064805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a7e15c-cf6e-42f0-a8d3-835c85224d98/66546856277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ea094b-9d85-4194-976c-0d748c95ac3d/what_is_management_and_administration_fees.pdfIn PDF document text
    • http://vavilonogamet.epizy.com/program_to_perform_binary_search_using_recursion.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/wovunaro.pdfIn PDF document text
    • http://wupumod.rf.gd/45305922769.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 5116 bytes
SHA-256: ef93580f59fa617dceeb974ff794efc66692c26c3260a7913af09c551b3cb989
font_01_sfnt_off00010d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 11740 bytes
SHA-256: 284a8289bcf726ae3d841020c151c6dec00a2c72cde3eeeebeb4d8a972931906
font_02_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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