Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bc1531812e4b71…

MALICIOUS

PDF

79.4 KB Created: 2021-03-26 08:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f7df0bc037a2ccd3490681907c422415 SHA-1: 3f730d85436a3b684b85350cea220523d7cdb64c SHA-256: 19bc1531812e4b714f52ced6332bbb4c5b0006bb07154e62ef2f3a4c4ba5309c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'Ielts reading examples pdf', which is likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/award?keyword=ielts+reading+examples+pdf PDF link annotation
    • http://wivuperafuzo.mypressonline.com/bayesian_ideas_and_data_analysis_christensen.pdfIn PDF document text
    • http://nuxagoliwanep.22web.org/white_platform_boots_fancy_dress.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/fbqjfxv/buwibeja.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/catalogo_inglesina_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/diibGfK/dune_book_3.pdfIn PDF document text
    • https://pekijazezob.weebly.com/uploads/1/3/1/4/131407278/bodiwujijeko.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/agMhbsL/parks_and_recreation_australia.pdfIn PDF document text
    • http://nibofope.66ghz.com/bsc_nursing_syllabus.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/adiabatic_batch_reactor.pdfIn PDF document text
    • https://tinajozu.weebly.com/uploads/1/3/0/8/130874666/3272602.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/lipudeseku.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/sogupura.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/jcUtiht/project_scheduling_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xumupojamax/d11jKNW/mods_para_minecraft_pocket_edition_beta.pdfIn PDF document text
    • https://giruwikepu.weebly.com/uploads/1/3/4/4/134464081/00de417ef2a.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/gdiKbhi/nuxewawov.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/gchca2Q/zibeximiselaguripipiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/eihjdSI/64419469808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nidawijonag.rf.gd/aldiko_book_reader_mod_apk.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_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 5368 bytes
SHA-256: 937371a4c5f6fc31e6d5c12bb03b3124ffa306ea87bed5f830775c6dfd0aae4f
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 13508 bytes
SHA-256: 3bcf11a5b7d9bf907c033431968fb1f71d29388be1bd3542da10014bd90c778c

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