Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d9078d681a0570…

MALICIOUS

PDF

94.7 KB Created: 2021-03-03 22:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa035c282a792425a832830d21c87b6 SHA-1: 9f83121429912df3e2edeb796e4baabb347352f3 SHA-256: e8d9078d681a05709c26ad9cd3ee93ae74b6c566a77bbff3f509636e0fe1552c
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, including one pointing to 'pelibifir.ru' which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent.

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://pelibifir.ru/123?utm_term=los+juegos+del+hambre+sinsajo+parte+2+personajes
    • http://wufamega.scienceontheweb.net/customer_service_officer_job_description_sample.pdf
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fe7959b8009c.pdf
    • https://gabinabadebaxir.weebly.com/uploads/1/3/1/4/131408928/dodowiremor_mivuxax.pdf
    • https://cdn-cms.f-static.net/uploads/4383699/normal_6024545ebb2f1.pdf
    • http://daludaja.getenjoyment.net/jumiwiparukifupav.pdf
    • http://flylovel.com/tutulifumapuxebureovelh.pdf
    • http://wisecredit.info/86039561677hrlff.pdf
    • https://static.s123-cdn-static.com/uploads/4452853/normal_5fe209b2eabb9.pdf
    • https://cdn-cms.f-static.net/uploads/4427293/normal_601dc80fa7516.pdf
    • https://vuverararusug.weebly.com/uploads/1/3/4/8/134883490/452834.pdf
    • http://worameruvejaka.mywebcommunity.org/sat_subject_test_biology_score_calculator.pdf
    • http://sutiboju.sportsontheweb.net/salesforce_tutorial_for_beginners_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fe367acbe960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jitapalerex.rf.gd/los_angeles_airport_weather_report.pdf
    • http://juludiripo.myartsonline.com/newenufob.pdf
    • http://xikepidefam.epizy.com/weber_spirit_grill_grates_lowes.pdf
    • http://mopezit.epizy.com/naledovawutadipinejowe.pdf
    • http://jezujemoxube.epizy.com/povinagiwubizesu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012238.bin
84def1b86ecacdd340e062d2c32518865eba9e409bf67d227d49ed27ff1da739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12238 5544 bytes
font_01_sfnt_off000134e3.bin
bd8116cd4622693030f8ad7dafe13ea15598a789db102619bea3c4ef847bd97f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134E3 12428 bytes
font_02_sfnt_off00015d05.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D05 4324 bytes

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