Malicious PDF — malware analysis report

Static analysis result for SHA-256 85dc4c4884840f9c…

MALICIOUS

PDF

74.9 KB Created: 2021-04-04 07:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b4eefac0dbc6c834d47c75761463b8d5 SHA-1: b7b0a6e6e69783a205386094821897e6e30ee3c3 SHA-256: 85dc4c4884840f9c1627f21b9f65a01dbe0ba3ca4dab9089b7162905739cfdd6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable hosting and domains associated with link farms, suggesting an attempt to redirect users to malicious sites. The document body, though partially corrupted, indicates a lure related to scientific papers, aligning with phishing tactics.

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://dugedepap.ru/award?keyword=karya+ilmiah+bahaya+merokok+bagi+kesehatan+pdf PDF link annotation
    • https://cdn.sqhk.co/tenalewi/hc8SMjh/tatonotufu.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/9hgWAib/define_diaphysis_medical_terms.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/hbjgIdH/tv_game_show_hosts_2000s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_6010d4634009f.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/timaxokusedejiwojojiloti.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/brain_food_book.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/application_format_for_school.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/cihhhij/20459481026.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/fjbjihh/siren_head_guide_horror_game_scp_6789.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/kunorizilisafexowixataf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fe48c3ad6e58.pdfIn PDF document text
    • https://cdn.sqhk.co/kusukogan/gfhajfi/zodedavaninemefejutileg.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/gjgeixP/azarenka_vs_osaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390637/normal_6009abf9a52d4.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/781e6b03-85a0-4b54-bb0e-87ebb81803ff/29715339454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154e58f0-bbc5-43e0-a033-cf9aab7034ad/do_we_have_free_will_bible_verse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a7e640-44d2-41c0-bae2-9826a4744fbf/apex_ld4688_tv_stand.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/the_pigman_audiobook_chapter_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1bd19b-435d-414c-9073-a3518ae4b083/famous_quotes_of_zig_ziglar.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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 5728 bytes
SHA-256: da36c57a9dcc9474f23c1635bf3d2e7b5ad835e673170e543c888f7380b3163e
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10440 bytes
SHA-256: 0bc19ce84d18fc216aa5115329abf4560b12c56a0971ca29687000c3e07b8b35

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