Malicious PDF — malware analysis report

Static analysis result for SHA-256 82adddc7fbfc1878…

MALICIOUS

PDF

66.1 KB Created: 2021-03-28 00:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2145ef43e1020671b1e9b32766b1a52f SHA-1: 59f090469c823279657e10a188e92c6a2a05e208 SHA-256: 82adddc7fbfc1878409221887411832c9b3b73f3232e782e6ddc81aa394ec00d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to "Sepsis 3 guidelines 2016", a common tactic for phishing campaigns. The primary attack pattern involves directing users to external URLs for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/123?utm_term=sepsis+3+guidelines+2016 PDF link annotation
    • http://fafesixokegigi.getenjoyment.net/zozekusubugowiv.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/alban_berg_wozzeck.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/cambridge_igcse_chemistry_workbook_third_edition_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/hagcgjd/jonitedugowitetot.pdfIn PDF document text
    • http://wopizup.mypressonline.com/26798557335.pdfIn PDF document text
    • https://cdn.sqhk.co/todezuzutito/HAzghie/83790385821.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/pjejdKa/mikirepoki.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/oijyjhP/51406562432.pdfIn PDF document text
    • http://jemofukamuwol.22web.org/rawibuzej.pdfIn PDF document text
    • https://cdn.sqhk.co/wesegagage/PDjaDii/camp_island_lake_pa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_f7f085a1171f405baff9c03fadc26bc8.pdf?index=trueIn PDF document text
    • http://nuwixunosozi.epizy.com/what_is_educational_psychology_and_its_scope.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_a56986d83d5e4ddc9eb5369b1e3115fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d199c8-bb21-47d2-9d77-dd437054007a/how_to_fix_onkyo_receiver_no_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/business_consultant_resume_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d23b8b-e839-40fd-b373-6556048f199e/54543870423.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/oceanofpdf_similar_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f901eb1-7708-4039-95e0-e45c51e03b8b/easy_electric_guitar_songs_for_beginners_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7285658-dad6-40fc-9948-8c77a1bf6338/media_exposure_definition.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_off0000c5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C3 5568 bytes
SHA-256: f29b24c08d744776a97abbdea40a3fcbe4eed14fd8d839b5c2011c1bf3b29879
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 10124 bytes
SHA-256: 1ff51467f9a435b83c5191ca6f59a0c0b5f23cfad16a1b0d920a7b7adcc15963

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