Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a916caa4ff077ea…

MALICIOUS

PDF

87.4 KB Created: 2021-04-14 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e5972f0ea9fca0160d5965699e4a2140 SHA-1: 02c11a651e00ba22a78c7bc7f88af27e2c90db0b SHA-256: 8a916caa4ff077ea81aea6aa2f95faee2c4776656acb0db5ff44ee7ad1e4c42c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to rational numbers, likely a lure to disguise the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=clasificacion+de+los+numeros+racionales+fracciones PDF link annotation
    • http://tututot.mygamesonline.org/61693419769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_60505cd4784e3.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/22906842630.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/degijibajapif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff3063c7c7af.pdfIn PDF document text
    • http://prizinsta24.online/840729403234tjom.pdfIn PDF document text
    • http://fetedeju.mygamesonline.org/particularly_vulnerable_tribal_groups.pdfIn PDF document text
    • https://rizibibaruf.weebly.com/uploads/1/3/5/3/135383358/nojiwunofegaku-fibimavifeda-bosufux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_60666ce630ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_602d3adad1ace.pdfIn PDF document text
    • http://jubivigupowo.iblogger.org/41262529533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6029cc86d77d2.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/titema.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/real_talking_cat_download_mod_apki05n8.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/samopakamefap/34710576395.pdfIn PDF document text
    • http://wonumamirevaz.rf.gd/demography_textbook.pdfIn PDF document text
    • http://xikulajofag.epizy.com/cds_2020_question_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/novixebaf.pdfIn PDF document text
    • http://kowelakava.rf.gd/98133346181.pdfIn PDF document text
    • http://xawiwevivuzox.onlinewebshop.net/39179513265.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/sample_liquidation_report_deped.pdfIn PDF document text
    • http://jawafezirosozo.epizy.com/autocad_civil_3d_2020_tutorial_bahasa_indonesia.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 5072 bytes
SHA-256: 26f3e8d7b4ff6fb353436d0f9b134a2c4a5d8d675c00655d2b0e50554bf56cb0
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 12612 bytes
SHA-256: cdc3579b1859bc796fa9a70ab8bb482afc84215544bebab7b100ab1109205ddd
font_02_sfnt_off00013845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13845 16288 bytes
SHA-256: 952493635c0cf1b29c76b8777b225b4305aa05a5c9acb4a093f56b5f76394b3f

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