Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0915caa37ad9c52…

MALICIOUS

PDF

115.5 KB Created: 2021-03-19 18:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b0c2ff7fba9418aecd4710ebdb12f21 SHA-1: 7f8b825b33a2ab3c83c76ef88cf3f43613aeccb8 SHA-256: c0915caa37ad9c528fcab40bff5ea3bab764eef06c870332814bd4219fbcfe20
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to various PDF documents, potentially serving as a lure or a method to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://maypoin.ru/wix?keyword=hartford+courant+tv+guide
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/4810724.pdf
    • http://losopefopamusoz.sportsontheweb.net/linfoma_no_hodgkin_burkitt.pdf
    • https://cdn.sqhk.co/xeduwukaxusa/Jaojd4Y/80600882576.pdf
    • https://static.s123-cdn-static.com/uploads/4406166/normal_5fc92f77a60bd.pdf
    • http://towonededuv.medianewsonline.com/the_coding_manual_for_qualitative_researchers_second_edition.pdf
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/jarele.pdf
    • https://melesosinipedo.weebly.com/uploads/1/3/4/4/134475371/fekenanitapifona.pdf
    • https://vopemafewiza.weebly.com/uploads/1/3/1/4/131408930/nogakugipamodex-daxotebiluzas-dudafeguk-nanusesakadetef.pdf
    • https://wibipujesotut.weebly.com/uploads/1/3/1/3/131398272/rimuzig_lelux.pdf
    • https://cdn.sqhk.co/pofaxiniraz/iighgeu/instrument_tuner_for_pc.pdf
    • https://mifabawir.weebly.com/uploads/1/3/0/7/130776047/4789224.pdf
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/tagededir.pdf
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/76ceacedd96.pdf
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fc8995141b46.pdf
    • http://busevabafumoje.iblogger.org/free_android_file_transfer_app_for_mac.pdf
    • https://cdn.sqhk.co/dusivubeleza/7nFTdic/monster_serial_killer_movie_netflix.pdf
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/parutazimukejan.pdf
    • http://tokiridevifo.medianewsonline.com/rifewolarutitefexipafego.pdf
    • http://ravanusos.iblogger.org/analog_multimeter_scale.pdf
    • https://kitowido.weebly.com/uploads/1/3/5/3/135348724/buvevepated_fijezonuzakutud_tubevopuxabak.pdf
    • https://cdn.sqhk.co/nugutobudan/cifjjid/nasa_solar_observer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wowisosanazo.rf.gd/damodaran_investment_valuation_3rd_edition.pdf
    • http://kegibuluwuridof.epizy.com/tawonovikizirilum.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_off0001843c.bin
b5bb3d728481e60479bf5a80cb35aa26cfff58ec485223e42fe1539f7efcd6dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1843C 5000 bytes
font_01_sfnt_off00019557.bin
990c064e2927aaa080226b647c53281bfd3505e62a8e1157ce2c3a6b931e2a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19557 12636 bytes

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