Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8bb5b54997f2b6b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 07:25:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0ebbf6b12edd5d7f3f8b480e6e8b6041 SHA-1: dbfcc1ddc21ab9c3841bd17808b35e240c323872 SHA-256: d8bb5b54997f2b6b99e4a1731ae128f74fcd6604355725fb4e550e1d388b6506
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=the+river+wild+movie+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fda5498862a4.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/gjhhwKs/dolib.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/7811904.pdfIn PDF document text
    • https://cdn.sqhk.co/wopidevepip/Giag7hc/82094046176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459326/normal_5ff25392be4c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60148f1b5ceda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_60491e1ca10b5.pdfIn PDF document text
    • https://latezuletarok.weebly.com/uploads/1/3/5/2/135298634/964467.pdfIn PDF document text
    • http://jerijoba.iblogger.org/surifaxozibemekejoxij.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/lg_wireless_headphones_for_smart_tv.pdfIn PDF document text
    • http://gozatelaji.22web.org/best_food_dehydrator_consumer_reports_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_60355ae3685f9.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • http://gawajix.iblogger.org/mailchimp_subscribe_form_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475196/normal_6014784677193.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/bestuursrecht_in_het_awb_tijdperk.pdfIn PDF document text
    • https://zegexexu.weebly.com/uploads/1/3/4/3/134385137/rakukopasuj_gosezigefofib_dopugavugeto_lujag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzesideb.epizy.com/acca_f5_lecture_notes.pdfIn PDF document text
    • http://zopefunexot.epizy.com/nijub.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/fotalo.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_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 5068 bytes
SHA-256: 8c00934d880710e462937ff58c50ec3127e96bccfaa5c0723b4f61851aaf041c
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11264 bytes
SHA-256: f749656bc92dc6415d5935ffa81f3c5e1891685cfff18f35e70fbf8ec110f922

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