Malicious PDF — malware analysis report

Static analysis result for SHA-256 db935366f3ea02c4…

MALICIOUS

PDF

72.9 KB Created: 2021-03-02 10:22:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: de37626ea8e97ee0c2cb352f26bbc73f SHA-1: 9e7c1a227e9132d2ac8299ada25e463f7b54fc52 SHA-256: db935366f3ea02c4f8cfccccbff6957b060b8f61ad2efd4e7a3fc7e49d27a758
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/wix?keyword=locust+grove+middle+school+rating PDF link annotation
    • http://sdorovie-sustavi.xyz/introduction_to_ecological_biochemistryqzl48.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/78898674995.pdfIn PDF document text
    • http://idealica-official-it.website/71114934830buql1.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/jubomofevotezox.pdfIn PDF document text
    • http://laithub.pro/balupaginovuxizatirojewh1dzv.pdfIn PDF document text
    • http://lomizagin.iblogger.org/46288814789.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/what_is_the_most_difficult_question_for_a_forensic_psychologist_to_answer_correctly.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/3958110847.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/vudegibuzezemejubak.pdfIn PDF document text
    • http://lumacy.site/78929751516lelp7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/how_to_use_icharger_406_duo.pdfIn PDF document text
    • http://sobumewupuvuve.epizy.com/berkshire_ma_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/kifumina.pdfIn PDF document text
    • http://fevepapowiwed.epizy.com/loxovetelebilimesur.pdfIn PDF document text
    • http://jodekiwob.rf.gd/download_app_to_learn_korean_language.pdfIn PDF document text
    • http://kotazok.epizy.com/88684116448.pdfIn PDF document text
    • http://dupumimegijema.epizy.com/craftsman_26_electric_start_snowblower_manual.pdfIn PDF document text
    • http://kakununul.epizy.com/90434108293.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/bukapajo.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/lisp_cutdim_cad_2007.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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 5356 bytes
SHA-256: ecbcaa6e7fbd9c9b1a6c16eddd1119c947cbb215005cc06fc74ff95144336613
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10372 bytes
SHA-256: 2585d60784c55787a386d640ed3ca2220b2ca179f6cc0a17801692782655c627