Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e616b49f74de14…

MALICIOUS

PDF

77.3 KB Created: 2021-03-16 07:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5b55734dfd15bee1bb2e121ec792cd3 SHA-1: ecd16926dd05a1ea1c237dcefca501a2fa57bbc2 SHA-256: 18e616b49f74de1421336092d470cad28f2b0ace25a5a417b125cd2dfde2ceff
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are part of a link farm, and is flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it uses invoice and browser update lures to trick users into clicking links, which likely leads to the download of a second-stage payload. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://resalured.ru/aws?utm_term=bissell+powerforce+helix+vacuum+belt+walmart
    • http://rasudilikid.mywebcommunity.org/simple_present_tense_wh_questions_exercises.pdf
    • http://nomokesus.sportsontheweb.net/69466047136.pdf
    • http://lijasojaxivura.22web.org/88931084115.pdf
    • http://sigisuzuk.getenjoyment.net/hodder_cambridge_primary_science_stage_5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mijovutotukedes.onlinewebshop.net/diccionario_ingles-espaol_oxford_pocket_descargar.pdf
    • https://uploads.strikinglycdn.com/files/5a0996d5-66c2-4b62-b2b0-38fd30983b3d/is_free_parking_in_monopoly.pdf
    • https://s3.amazonaws.com/genedonapubefe/aegis_legend_kit_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/bad3b9d6-a8fa-4788-8d2e-8baaa548c6da/67988068326.pdf
    • https://s3.amazonaws.com/fevobelijogal/amc_8_honor_roll_of_distinction.pdf
    • https://s3.amazonaws.com/bokexizometun/36806406069.pdf
    • https://s3.amazonaws.com/golepe/deloitte_advisory_services.pdf
    • https://s3.amazonaws.com/dupula/pefidaxubutatudawedigibi.pdf
    • http://riwimowuf.epizy.com/toyota_sienna_maintenance_required_light_flashes_6_times.pdf
    • https://s3.amazonaws.com/kefodek/relimasemefumejazuv.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_6f3ba4f233334e2c9ebae42065d13036.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f053bbfa-4e89-49c6-8c6c-b555e9f14e2f/wufapodedopovuzojurikaxal.pdf
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_9d351aa934f04ae9b92b752fe8ec2288.pdf?index=true
    • http://zekubegem.epizy.com/begotu.pdf
    • https://s3.amazonaws.com/tiniruru/aarakshan_bollywood_movie_free.pdf
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_7c43da47708e45e08a021a4df8eecf3c.pdf?index=true
    • https://s3.amazonaws.com/lukepepe/metikal.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef23.bin
123247e82cd79b5840bbc9d624693aba13d8c53ae118e3a577771fdae5449c0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 5664 bytes
font_01_sfnt_off0001025c.bin
bb027afffbc1d6165f0718fe30da07a1d241849a28b78154dcf28fc4bc651dee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 10936 bytes

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