Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b7c1462812b574…

MALICIOUS

PDF

73.2 KB Created: 2021-04-24 23:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 95220026e2e8fc536e7ab5d47830fed8 SHA-1: 0389e9e884be2cbe67ec6122909c565c47450e3b SHA-256: 91b7c1462812b574562da6a26c22673f3df9f767665cf770c0647125cac6b418
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of a URL pointing to a JavaScript file further supports the likelihood of malicious script execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=line+6+floor+pod+plus+for+sale PDF link annotation
    • http://italystore.pro/76227884375m6sue.pdfIn PDF document text
    • https://tonawonigavima.weebly.com/uploads/1/3/5/3/135345065/pobuveviwawofig-fixajuguwinenom.pdfIn PDF document text
    • http://davusivit.22web.org/36296636405.pdfIn PDF document text
    • http://matras-24.ru/define_programmed_learning_in_hrm4xpwy.pdfIn PDF document text
    • http://tugawuwumix.22web.org/wusov.pdfIn PDF document text
    • https://gejimedetudumi.weebly.com/uploads/1/3/3/9/133997730/wurufazakaj-luxutadogireje.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/6782771.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/da42aea5e02465.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/5217917.pdfIn PDF document text
    • http://good-production11.site/65490226767q7xlo.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/mavepinav.pdfIn PDF document text
    • http://bujenaro.scienceontheweb.net/94376532616.pdfIn PDF document text
    • http://buylettersonline.com/how_do_i_activate_my_tracfone_sim_card1wa6s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widepidaba.atwebpages.com/pdf417_barcode_scanner_javascript.pdfIn PDF document text
    • http://jivalaki.rf.gd/why_are_composites_used_in_aircraft.pdfIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_58fb56b5421046fd980f13b0487ae23b.pdf?index=trueIn PDF document text
    • http://solarujarinobo.myartsonline.com/leadership_style_assessment_tests.pdfIn PDF document text
    • http://gatakokuto.rf.gd/deeper_pro_plus_user_guide.pdfIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_d526c83df7f348bfb07db4a77ba76e0a.pdf?index=trueIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_4980330f9ced4c68b51d0bb06010c431.pdf?index=trueIn PDF document text
    • http://tujatubaniza.epizy.com/12426908232.pdfIn PDF document text
    • http://bafovupopevepus.epizy.com/17317076270.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/galileo_bertolt_brecht.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_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 5132 bytes
SHA-256: a95ddd9e91a86cd00db69cf0aa0d5ab8d10197ee8959b65827b29ef63e9ecf3c
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10060 bytes
SHA-256: c3fba6602dd293c084ffbffeb67a0e529764c0961774b95fba562235e9ce3228

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