Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d68ef4b1404c14b…

MALICIOUS

PDF

69.7 KB Created: 2021-02-19 01:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dcfa08dc55aa72fbbe574e96df80fae0 SHA-1: c773732adf6188a8f5a8d0fcc1d7dfe2262d7989 SHA-256: 5d68ef4b1404c14be5a564ae0a9a84ed81bd49d8168ee916fb18af48b7013a07
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to potentially harmful sites.

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/strik?utm_term=mitrokhin+archive+volume+2+pdf+download PDF link annotation
    • https://tofariviviri.weebly.com/uploads/1/3/4/1/134109347/gosixegarituk.pdfIn PDF document text
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/bizazaxumubi.pdfIn PDF document text
    • https://vonemiwez.weebly.com/uploads/1/3/0/7/130776812/1341064.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/gAhdugj/41817817122.pdfIn PDF document text
    • http://pigovaze.iblogger.org/change_improper_fraction_to_mixed_fraction_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pibunowawoxi.epizy.com/pevesate.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/biology_grade_12_khmer.pdfIn PDF document text
    • http://gamanavaje.epizy.com/philip_kotler_marketing_management_free_download.pdfIn PDF document text
    • http://notufexunu.rf.gd/dubai_metro_stations_map.pdfIn PDF document text
    • http://bukaduxanob.epizy.com/risaroxogojiti.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/bwssb_recruitment_2018_notification.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/bikha_angni_gaow_bodo_song.pdfIn PDF document text
    • http://zomoludefifev.rf.gd/modern_world_history_textbook_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 5568 bytes
SHA-256: f29f04eff6a4289f0c3b6cc1e0855a9b4ff9a631f46fc49f7784981817106ce5
font_01_sfnt_off0000e60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60B 10568 bytes
SHA-256: 0b70985d118709d1d581101787d334ea7cb051d37c8b0b354afe9cf745cf9638

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