Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad089cc66b12f0d…

MALICIOUS

PDF

85.5 KB Created: 2021-03-18 01:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 840304fe32328e54ba3348cbefeb9185 SHA-1: e3adcc4109ec0d32ebe892230d968819103b71ed SHA-256: fad089cc66b12f0d731c242e5d5fdac875cc6a016659f9dc6776232a7d528c27
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to malicious sites.

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://vilenefex.ru/strik?utm_term=what%2527s+a+good+gre+score+for+pa+school
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/8958290.pdf
    • http://urott-hu.com/tartl_ortalama_maliyet_yntemih8ut4.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/sepagumode.pdf
    • http://opit.space/card_matching_game_online4e9eo.pdf
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5fcee33d71dcf.pdf
    • http://ighelpcenter.xyz/weather_report_standishpktan.pdf
    • https://cdn-cms.f-static.net/uploads/4484365/normal_603b2f8f2b2df.pdf
    • http://in-step.shop/the_art_of_acting_book227iu.pdf
    • http://ejinaya.com/mujijudk0ekc.pdf
    • http://cmb-eco.com/41565021842n6v7h.pdf
    • http://importants.space/sogalopujopulinemo38a1l.pdf
    • https://cdn.sqhk.co/kafosine/shg1Eja/informacin_de_mala_calidad_en_ingles.pdf
    • https://static.s123-cdn-static.com/uploads/4388608/normal_5ffea78af19d1.pdf
    • https://diwodineguxep.weebly.com/uploads/1/3/4/3/134305573/4692520.pdf
    • https://cdn-cms.f-static.net/uploads/4402953/normal_601f002513870.pdf
    • http://italysummer.fun/58045298652c420.pdf
    • http://bestunew.xyz/how_to_write_short_and_long_term_goalsjim25.pdf
    • https://cdn.sqhk.co/litonesi/0ichgLN/pitufigidoviji.pdf
    • http://fastpeysistem.online/bezubaan_ishq_movie_mp4os6b1.pdf
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/9646720.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/28dc5ae992407.pdf
    • https://static.s123-cdn-static.com/uploads/4383918/normal_5feeeffe6ca6b.pdf
    • https://cdn.sqhk.co/suwapipejob/idfpAYY/dci_digital_career_institute_kununu.pdf
    • https://cdn.sqhk.co/sidamebo/jfUhhgi/suppressor_cover_silicone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00010fa1.bin
1176c254fe1d5bf69f73b8358751896998fef367f860d6e675ec161daba29a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 5464 bytes
font_01_sfnt_off0001224a.bin
ad1719f91259699f99f5cba1acdf4986440c6d4a4d657db18d050dea6e8906b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 11096 bytes

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