Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d6ea27f06bc939…

MALICIOUS

PDF

67.4 KB Created: 2021-02-27 07:54:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e506e9285efef34dcf0ccdae77873f26 SHA-1: 12013f8f819f51467802f1f8b62f0ef142bd60bc SHA-256: c8d6ea27f06bc9397e58cc36bd95933790a27cdc7e953a4151f580f40e874b6d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://kuzutuzo.ru/wix?keyword=honey+you+are+my+shining+star+ringtone PDF link annotation
    • http://dvestideyli.xyz/ielts_english_speaking_topics_with_answersjk23e.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/hjEaZgi/9round_pulse_points.pdfIn PDF document text
    • http://life50it.pro/beravotunulojol2ed0u.pdfIn PDF document text
    • http://dressnbuy.com/gelojofizazopiwuxegetuo7ani.pdfIn PDF document text
    • http://onesmall.space/12516732793veia9.pdfIn PDF document text
    • http://begemotiks.fun/which_activity_would_likely_be_performed_by_a_knowledge_workerqmfrk.pdfIn PDF document text
    • http://gatorama.space/2447101067c6mqm.pdfIn PDF document text
    • http://starkrobotics.org/266582416851lys.pdfIn PDF document text
    • http://arbitestpark.xyz/85707243317ubsfb.pdfIn PDF document text
    • http://tokio-2020.fun/baixar_dj_wagner_2018_cd_completoa00hh.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/lagoneseparuxuvclsmd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dagajevefud.epizy.com/bootstrap_modal_form_example_jsfiddle.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/choir_music_sheet_holder.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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 5128 bytes
SHA-256: 7f5ffca5e06bda1950cb71d7ae4a6ae773e36d1d566618c85da7017cfce5ca82
font_01_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 10004 bytes
SHA-256: 8a5873fc5e995518a8b0d239af8abf75714a6cacc3b56712140e3ebdb2b3f340

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