Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45fb32274d086fa…

MALICIOUS

PDF

72.8 KB Created: 2021-03-15 06:45:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6cae64b9028f1475ccec215e25f92d7 SHA-1: ebee727ebf29e2fdca9859ad88faac2119462e12 SHA-256: f45fb32274d086fa74fbbcd3697f977216898642dd113891bd6dd0854bfb70dd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=cnn+10+student+news+february+5+2020
    • http://paxezimusosesa.scienceontheweb.net/9818487613.pdf
    • http://jonebukusopovet.mygamesonline.org/what_the_bible_says_about_your_comfort.pdf
    • http://sajiwurejedetu.sportsontheweb.net/74027599640.pdf
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/8777991.pdf
    • https://cdn.sqhk.co/zopisipiwele/hhgh3jg/govusiponisifapexev.pdf
    • http://jobediniberine.scienceontheweb.net/maguwudod.pdf
    • https://cdn.sqhk.co/pulazapusaw/iaieBLL/sisters_of_mercy_urgent_care_weaverville_nc.pdf
    • http://disuditifejugu.iblogger.org/87224782633.pdf
    • https://cdn.sqhk.co/xejadukoxeta/jaJhhjj/smartsheet_tutorial_youtube.pdf
    • https://vojelapavefiga.weebly.com/uploads/1/3/4/3/134308780/8896911.pdf
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/fovaniwutof.pdf
    • https://cdn.sqhk.co/jojikoxazew/hbgicnR/kagudeba.pdf
    • https://cdn.sqhk.co/pisapaxosabo/gcnGqid/97608437328.pdf
    • http://rupitori.66ghz.com/nowedamatofakogobizovot.pdf
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/1251849.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nononulavojiki.myartsonline.com/brandon_sanderson_cosmere_wiki.pdf
    • https://uploads.strikinglycdn.com/files/c88e81a4-e7c0-4899-b080-4ea4fcee835e/wilaxuvafinipe.pdf
    • http://luwawabegopit.rf.gd/solid_principles_uncle_bob.pdf
    • http://nesitojogosew.epizy.com/heiter_bis_tdlich_hubert_und_staller_episodenguide.pdf
    • http://wusumuforibit.epizy.com/how_to_bypass_alpine_parking_brake.pdf
    • https://uploads.strikinglycdn.com/files/5cdd18ba-b6ce-44ec-a959-dcf03170cd92/14697041976.pdf
    • https://uploads.strikinglycdn.com/files/aacd9302-5039-4a89-83ac-2f268da3f896/on_writing_well_william_zinsser_chapter_summaries.pdf
    • http://netomadutimafe.onlinewebshop.net/wimenifonidufixovi.pdf
    • https://uploads.strikinglycdn.com/files/83bba548-3e62-4277-b374-9f9b79835bef/34813328485.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_off0000dd19.bin
4dc8b377be0c0f0ce9735254d3b40c9549ea0eaf99fd6d1611b4ddcd00cb8464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 5556 bytes
font_01_sfnt_off0000f02e.bin
2097ff7856217b99e68a83d0c4df8aff8a744d30d7625e9290554a44be502ba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 11124 bytes

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