Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ffea458f8948a9…

MALICIOUS

PDF

68.1 KB Created: 2021-04-05 06:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d98b3d9a75e2a95330df20223e0f3311 SHA-1: da8ad7305c0e646f8d080c776607378828673f31 SHA-256: b6ffea458f8948a9253ab26d0ae0329dff88e5d8ecc36110a2fc4f2ced2bbebf
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded URLs, one of which is a link farm on disposable hosting, and a heuristic indicates a lure to enable macros or editing. The ML classifier output of 0.999786 strongly suggests malicious intent.

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 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://kuzutuzo.ru/wix?keyword=iambic+pentameter+worksheet+macbeth
    • http://lajodibibodi.getenjoyment.net/benzodiazepinas_anestesiologia.pdf
    • http://wijofotezopadik.medianewsonline.com/bearings_maths_genie.pdf
    • http://xojuxegalixiluj.66ghz.com/nusuku.pdf
    • https://cdn-cms.f-static.net/uploads/4419633/normal_60310b7260e33.pdf
    • https://static.s123-cdn-static.com/uploads/4413975/normal_5ffd9df47efff.pdf
    • http://kimagibasip.22web.org/17133480579.pdf
    • https://cdn-cms.f-static.net/uploads/4470223/normal_600e7cba96033.pdf
    • https://cdn-cms.f-static.net/uploads/4388040/normal_6035f1f74cb90.pdf
    • http://rixuliketasaban.mywebcommunity.org/latutifemeramukenorodipox.pdf
    • https://static.s123-cdn-static.com/uploads/4373505/normal_5fe4e7f8ede57.pdf
    • http://luwogexejel.getenjoyment.net/rebif_package_insert.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://memamawu.onlinewebshop.net/38892732525.pdf
    • http://zabukek.rf.gd/94060086593.pdf
    • http://duxegejuw.atwebpages.com/aditya_hrudayam_telugu_slokas.pdf
    • http://nujenikob.epizy.com/keto_diet_for_beginners.pdf
    • http://kelakubusadifi.epizy.com/impulse_response_sample.pdf
    • http://figijosi.epizy.com/thule_bike_rack_ski_adapter.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd64.bin
a248624ac9c49f80ae42b6d4dfcedda5c57bf5f0fb002c8ec190bc06095a237c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD64 5376 bytes
font_01_sfnt_off0000df90.bin
3702d2cb2f4017a094e219f35ab3619b24d48ddb2c152ef03ef7bfae577e51c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 10560 bytes

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