Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5b734cd1908241…

MALICIOUS

PDF

185.5 KB Created: 2021-05-14 03:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1fee7c256c24e76849edf380e7a643d2 SHA-1: 14a1cae4525c96d92205ce6ca1209943da8c8f7c SHA-256: be5b734cd190824125cf6a54bf38db9565458040e233981ac918c5b3a98884fe
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with attempts to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/strik?utm_term=muse+unintended+acoustic+guitar+chords PDF link annotation
    • http://fakurivevid.scienceontheweb.net/16875032800.pdfIn PDF document text
    • http://tuwavetatifida.iblogger.org/aerosmith_festival_2017_setlist.pdfIn PDF document text
    • http://witomemu.scienceontheweb.net/xojorudowetamobilojexex.pdfIn PDF document text
    • http://francobusiness.com/nokenedxd6g.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/apology_languages_explained.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/zunesimawekapule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476580/normal_6000386e58f61.pdfIn PDF document text
    • http://pristav.pro/kutofisadeta2bqq.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/fozabulomevazezu.pdfIn PDF document text
    • http://nodefiw.medianewsonline.com/44272911430.pdfIn PDF document text
    • http://pogadai.xyz/2002_honda_civic_maintenance_lightxycz8.pdfIn PDF document text
    • http://idealica-official-it.website/jixewas4uqnc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_606a02002713e.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/wutixof.pdfIn PDF document text
    • http://art-practice.org/begatazesubaxoymwfh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jakosorer.epizy.com/58996499672.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/farm_animal_song_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/how_do_you_manually_unlock_a_kenmore_washing_machine_door.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/14980890648.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/jazzy_electric_wheelchair_battery_replacement.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/takeuchi_tb290.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_off0002a051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A051 5172 bytes
SHA-256: 8e31ca361670847c60150f52bf96c9d77c8cb307cc8d50a346965aaff62fd997
font_01_sfnt_off0002b1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B1EC 11328 bytes
SHA-256: 7494ea5759abffdbd0ccb72b90dca10f64413ddb0954e7aa3ac79c807b18ebbc

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