Malicious PDF — malware analysis report

Static analysis result for SHA-256 985c5eb8b8c2e010…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 11:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6af71c7c6a9eb2071f6f03027e5c71ec SHA-1: 75140532f05ab2827ad786171fa7b57d27e802c6 SHA-256: 985c5eb8b8c2e010e0a1ab7b18c19bce607d18ea1530f6d95d47b1fb78cd3874
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, one of which is explicitly related to 'award' and 'english modal auxiliary verbs pdf' to disguise its malicious intent. 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 hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=english+modal+auxiliary+verbs+pdf PDF link annotation
    • http://vijofudevadotar.mywebcommunity.org/the_beloved_charioteer_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/Fjjygfw/sukolamaluvulodolaw.pdfIn PDF document text
    • http://azalea.store/sony_icf-cs15ip_remote_controlzczp5.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/52597967585.pdfIn PDF document text
    • http://labiosdewonda.com/android_toggle_button_selected_color5az8a.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/ehboZ08/91181759980.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/gibbUja/dazatumagigaji.pdfIn PDF document text
    • http://nakozek.mypressonline.com/dotarutex.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/gfgeZie/air_fighter_games_for_pc_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/i5EaIxL/lanoxudegirug.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/vjfqY7J/ronurazoko.pdfIn PDF document text
    • http://tgesheff.xyz/46313300614rrcgz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/bodagegogexulodiganekawo.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/harman_xxv_pellet_stove_distribution_blower_not_working.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/simple_present_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58105d9a-a3d8-4e51-afec-a28a2e52bcea/python_3_range_invalid_syntax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d5f3882-033d-43a7-85a3-4e5817a902cc/how_to_download_minecraft_java_edition_for_free_on_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/34398542166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097601cb-2e0e-4501-a1f9-8f8e769ee20c/apush_final_exam_review_periods_1_5.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_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 5784 bytes
SHA-256: 05a016e7d30804c2798e7235ae36d1d4cae89bbcc09748bdc0e6ea1f2aaf6003
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 10528 bytes
SHA-256: 10891dba95e6057b0a2f2e53efc8537a5df20c160818926b5341515fe2d95101

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