Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6b1c1ac9a59c5d…

MALICIOUS

PDF

66.4 KB Created: 2021-04-02 11:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b699f3a8f4649db122804a6005a10e0 SHA-1: dad987312bcf67848947210fc96c2afcc6088068 SHA-256: 6d6b1c1ac9a59c5d8b50582b33fc67644edd96321c988b723e451af29c02f17a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with one prominent link pointing to 'https://pelibifir.ru/123?utm_term=logo+quiz+answers+level+25+iphone'. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm and phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=logo+quiz+answers+level+25+iphone
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/selugisasu_vazugo_wuromoril.pdf
    • http://zobabikox.medianewsonline.com/defazanu.pdf
    • http://jukojadijomefar.medianewsonline.com/492162694.pdf
    • http://vizemezezu.sportsontheweb.net/the_aloha_spirit.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/6173824.pdf
    • https://fizobadajavene.weebly.com/uploads/1/3/4/4/134492874/1679946.pdf
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/walusarivuruwi.pdf
    • http://dabopoxele.getenjoyment.net/autodwg_to_dwg_converter_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tozaduliwubega/how_to_calculate_power_loss_in_ac_circuit.pdf
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_61d951f5cde343adab3477082c2ec3af.pdf?index=true
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_c4553853c9514c58ab9bf8ca899e9c7d.pdf?index=true
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_ae12972d23e24fe59a75ad78842b6dd9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/89b8f0aa-a6c9-42a5-8f66-7c844c3223c5/truth_and_method_hans_georg_gadamer.pdf
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_20ae72fb910e48e78e942eeda68b597d.pdf?index=true
    • https://s3.amazonaws.com/vatosolikijike/ps3_bruteforce_save_data_program.pdf
    • https://s3.amazonaws.com/wipotegadodorek/anime_wallpaper_android_app.pdf
    • http://duvodix.myartsonline.com/united_carry_on_bag_size_2019.pdf
    • https://uploads.strikinglycdn.com/files/7d278fa2-2d75-4b11-b873-84e14aed18b7/vesuvamere.pdf
    • https://s3.amazonaws.com/pipaneku/lezatukixaw.pdf
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_6a100491002c469c8a6e168d6eecbc95.pdf?index=true
    • https://uploads.strikinglycdn.com/files/18b553c7-0637-4f8f-a88e-f8a13210e797/jijot.pdf
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_2ce0fcc8dc5948deaeed98d526cb6194.pdf?index=true
    • 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_off0000c773.bin
9ad76ef64610ac57a57aaf11c45affce4ecf56d5b6df2d602563c94f8a82e34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 5604 bytes
font_01_sfnt_off0000daa6.bin
d8ac680bb71043b064c8390b91b75309f950b4bf6ba44287f9285aaedea4b85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA6 9908 bytes

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