Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a07e8c605f35098…

MALICIOUS

PDF

74.4 KB Created: 2021-03-27 14:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6cea330a5d7720fb7b98e5957d8d8c2e SHA-1: 89dee8c47d0fab655f1801a628d887db80c0f290 SHA-256: 5a07e8c605f35098961aa1e2f67f96900a201f200e31b8137c756112600dd63b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous external URIs, with one notable example being https://leonvi.ru/123?utm_term=blessed+be+your+name+sheet+music. The presence of external links and the overall structure suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

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://leonvi.ru/123?utm_term=blessed+be+your+name+sheet+music PDF link annotation
    • http://witefuxav.22web.org/free_romantic_book_download_for_english_grammar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_6054d9260b35e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_600278f2ccaa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/626554b0-9419-42af-b0e1-c8d624d4013b/the_secret_book_summary.pdfIn PDF document text
    • http://bokipivumuripo.rf.gd/gastrointestinal_system_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1da53ca-cd5e-4081-8854-2edb9428d89f/toro_22_personal_pace_mower_blade.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/free_bible_timeline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1bd104-1119-4142-858d-dc093ebd2be5/how_to_use_google_translate_offline_on_pc.pdfIn PDF document text
    • http://vometavofol.epizy.com/38400845372.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/foscam_fi8918w_ip_camera_tool.pdfIn PDF document text
    • http://bizetifokikifa.epizy.com/pakim.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/61259957679.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/46958286264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6719b0de-c04b-4145-89c3-69dbaae05f1e/nietzsche_thus_spoke_zarathustra_will_to_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb1edb1-efd4-4b68-a88d-4e2ac048e200/why_is_there_an_orange_light_on_my_panasonic_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/chamber_music_nz_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/dinabandhu_andrews_college_online_admission_form_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f47475d-552d-455b-9b14-58275dd335d9/how_to_make_cake_in_ifb_convection_microwave.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/suvajavuzuvip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be732ce-af62-4fbf-a141-34c11660d8d7/11th_ethics_and_indian_culture_new_book_in_english.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 5472 bytes
SHA-256: a378452309449aa1d7ffc5361c9bfea725c2fdb96ff76595760db28981325252
font_01_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 10944 bytes
SHA-256: 6a0fbea83d9720aa7777d14ecad85e80e2412e3eb9108a10906757d4368cc891

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