Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1338af6255e3b6…

MALICIOUS

PDF

72.5 KB Created: 2021-05-16 17:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b7542e8c8b193fedac0453b016acfa36 SHA-1: 5eb7e007b14288a804310418acb9c12f57bc91be SHA-256: ec1338af6255e3b68fa419bb18544de153dd78f6ac02d05608ca35eddc5000fb
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating an attempt to redirect users to malicious content. The presence of embedded URLs suggests an intent to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=asu+map+poly PDF link annotation
    • http://pabakijizozid.iblogger.org/motuworixufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_60212582e8dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_60114415bd0f2.pdfIn PDF document text
    • http://mivetys.xyz/34352466745v0342.pdfIn PDF document text
    • https://lupenasax.weebly.com/uploads/1/3/4/7/134738003/dajogivexiwoxe.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/0cf3568.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/braun_coffee_maker_filter_basket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_605ef6bcebbdc.pdfIn PDF document text
    • https://bodokevusigow.weebly.com/uploads/1/3/2/7/132740435/kimepi-wugikeb-wezikimi.pdfIn PDF document text
    • http://mnogolidov.xyz/33642202039qvzvb.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/bwv_106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454171/normal_5fcdf5cfd4533.pdfIn PDF document text
    • http://topcabinets.xyz/direccion_nacional_de_la_policia_judicial_ecuadorg01i0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406820/normal_5fca5dc9bcd8f.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/tomavanukokibapitogejuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_600baf4c7596b.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/9443384.pdfIn PDF document text
    • http://lg-supportteam.com/4305640309930y8o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_603be7c61e946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/bmw_navigator_vi_warranty.pdfIn PDF document text
    • http://rilojanegesov.epizy.com/how_to_adjust_a_snowblower_auger_cable.pdfIn PDF document text
    • http://xabugap.rf.gd/competition_car_aerodynamics_3rd_edition.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/2020_calendar_with_all_festivals.pdfIn PDF document text
    • http://xuneviwek.epizy.com/how_old_is_percy_jackson_in_the_last_book.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_off0000dd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD60 4960 bytes
SHA-256: 18f3e44db343a7bbd5d409170b5e00e20de679a9d209cbd813fda87d031ed13e
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 11472 bytes
SHA-256: 7686dfeed5e6f931212b19bd3ca868dabf1feed9712ca2452b360d371b039cab

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