Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36541769d9b32e4…

MALICIOUS

PDF

90.4 KB Created: 2021-03-20 13:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e838fc1b0503d8485540429b6a936bad SHA-1: bf82d70fe1a0cad5b349423ef8c09958868312d2 SHA-256: e36541769d9b32e4a15f6cb79861b44d1dcddadf1a67fe4c531a54089706e09a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wix?keyword=warframe+law+of+retribution+guide+2017 PDF link annotation
    • http://sawedes.mywebcommunity.org/ps_i_still_love_you_movie_hilary_swank.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5fc89109d3b21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377642/normal_5ff57730bfbdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_5fd94188cd475.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/sample_welcome_speech_in_tamil_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_603e1baf9996a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_6032056b2507d.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/55908860119.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/45229480165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_5fd6d3ab9e150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5feb1fd1cdeab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427795/normal_6038c3d4a5fd3.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/bokofapig/human_development_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/56459505958.pdfIn PDF document text
    • http://releboxodaw.rf.gd/wibizodasireba.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/rodrigo_concierto_de_aranjuez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529ff032-39ee-46c3-9428-5564fe98cc12/wumuzajexejil.pdfIn PDF document text
    • http://wurunuj.epizy.com/capitulo_1b_answers.pdfIn PDF document text
    • http://beluxupixid.rf.gd/xuwifisusexem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9846160-1945-46ea-b5f8-9514e2e047f6/66837503295.pdfIn PDF document text
    • http://mejovusemuvov.rf.gd/mofomu.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_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 5700 bytes
SHA-256: 6479ce43b8ccf660035f5805d0cb4d94a00aa5dce00920b8b6cde819c3259bc2
font_01_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 10948 bytes
SHA-256: 7d851e2c97c65bfaa17e466166f0a0ec1dd83b29cf5ebd4792381dcfb4b4482a

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