Malicious PDF — malware analysis report

Static analysis result for SHA-256 918042eae2683be2…

MALICIOUS

PDF

75.5 KB Created: 2021-03-21 07:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 325db5cf1a91751535363597b673fec5 SHA-1: 5dc013852ae81092987972ed396855291a3f9406 SHA-256: 918042eae2683be2d21f6fa5d01db9fda61aeff1127e81cdb6a40cbc89c07f9d
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/award?keyword=general+comments+for+students+reports+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491671/normal_6009d1a0242d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_604d000186a6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_601ddf3ee6e8f.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/b979c40725bf3.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/satopebobo-joxiluton-vukiforenim-suponawukixo.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/tipotorikijubi_jiwekutelopuk_ramovaxinefeta_relolopov.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/1462150.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/international_student_marketing_manager_job_description.pdfIn PDF document text
    • https://vijisazegogufob.weebly.com/uploads/1/3/1/3/131380966/zoxomavimeb-xezinopoj-tilopalix.pdfIn PDF document text
    • https://zibamikalizofu.weebly.com/uploads/1/3/1/4/131409526/midexet.pdfIn PDF document text
    • https://fuzurisef.weebly.com/uploads/1/3/4/3/134369427/waruti_niwagerodupusaj.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/goxededafofizis-novixumofalot-wezidop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxukimu.myartsonline.com/56642238659.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/40431484236.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_dec9b840bd9c437582657d5518df65b1.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_1729004e439c4bf294727949c379e334.pdf?index=trueIn PDF document text
    • http://puwomuf.rf.gd/fort_leonard_wood_fishing_report.pdfIn PDF document text
    • http://kujafugakare.epizy.com/tubisidifav.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_c4c12ce9ddae4dd099ce9215ed65ccd4.pdf?index=trueIn 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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 5332 bytes
SHA-256: 8550af40835fe02837405f8726fc56bc60545dcedbcfd5f626dae6585045509d
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 11256 bytes
SHA-256: f3f8ab487a769790d92514a0e9cc361caeffd6b560c7341d315ad51149bd1c3b

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