Malicious PDF — malware analysis report

Static analysis result for SHA-256 7585a9d00c70f811…

MALICIOUS

PDF

83.2 KB Created: 2021-03-03 04:17:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 6a843cf5e2b6d678ac253b0d488db652 SHA-1: 89df64d0bea9863b8cdaf58990c74b37b120cb03 SHA-256: 7585a9d00c70f811977656d50959ff16bf1d4da54f8b14b3106b0e2e66f07436
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 hosting, and exhibits characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, potentially as a spearphishing attachment.

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://vilenefex.ru/award?keyword=braun+multiserve+coffee+machine+filter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fcc08f20e9ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fffb90b9bc0f.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/Ugjidgg/fipobasesezovil.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/31884042876.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/wasowelixaboj.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/iiF3iji/kodeziratugujukuwimeloge.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/adventures_of_ibn_battuta_summary.pdfIn PDF document text
    • http://zakukat.iblogger.org/english_phonetics_dictionary_apk.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/ispe_guidelines_analytical_method_transfer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5fcba19b04157.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/gfgjgfx/wibisejugimubewigon.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/ghcigBH/stick_cricket_premier_league_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipuvofelope.epizy.com/96383250725.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/c._r._e_notes_form_4.pdfIn PDF document text
    • http://kizuxaw.rf.gd/sazudujisewo.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/jawono.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/67696053213.pdfIn PDF document text
    • http://bemajisuvu.epizy.com/situpiruguruniwotov.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/axon_use_of_force_form.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_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 5228 bytes
SHA-256: 110b7d5d3bc27b461464b8a391df93f0d0c1158119db9fecde73d05d6b8fecd3
font_01_sfnt_off00011be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 10308 bytes
SHA-256: fce3ecfd12c81a7270e6050379549b8ede22b2fe85eecadba46b04cce1e2a6ea

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