Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4a90faa49e48dd…

MALICIOUS

PDF

83.3 KB Created: 2021-03-11 10:44:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b34dcd4a40bd216d18b0245e22550b SHA-1: 2d9cbae1b90333de92520dfa291c753c3f60d6d7 SHA-256: 8b4a90faa49e48dd1534694af0bc23d50ed81a3f5fa2a238b9e51a4b22011a38
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used in SEO link farms to manipulate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/award?keyword=coliformes+en+el+agua+pdf
    • http://creditreportfast.info/linefojc9mg.pdf
    • http://topukovatawosu.sportsontheweb.net/science_of_mind_magazine_latest_issue.pdf
    • http://retamos.mygamesonline.org/programa_para_calcular_integrales_definidas_online.pdf
    • http://dusanaputojinon.mygamesonline.org/computer_workstation_ergonomics.pdf
    • http://vitetoka.scienceontheweb.net/nujefut.pdf
    • http://genoray.pro/ver_el_mundo_magico_de_terabithia_netflixwbvea.pdf
    • http://tibagisuminove.sportsontheweb.net/job_interview_questions_and_answers_for_fresh_graduates_philippines.pdf
    • http://italylife.pro/masonry_heater_plansozg8j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenisozazewubo/bc_speculation_tax_form_sample.pdf
    • https://s3.amazonaws.com/kukupunopedon/72032983705.pdf
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_a9c92c1ef5014342a223c809871ef6b4.pdf?index=true
    • https://s3.amazonaws.com/xidazeze/invitation_card_template_photoshop_free.pdf
    • https://s3.amazonaws.com/fosagobomap/99196110010.pdf
    • http://tapoloferazuziw.atwebpages.com/86328161950.pdf
    • http://muvekalufisu.atwebpages.com/mazekuxodipofapiliwuzo.pdf
    • http://kawerulim.onlinewebshop.net/plantronics_co54_connect_to_computer.pdf
    • https://s3.amazonaws.com/sixolose/nojorus.pdf
    • http://padijajuvon.rf.gd/pumisulikoxukomenuvu.pdf
    • http://nokizotef.rf.gd/wegokarufos.pdf
    • http://nogibusap.epizy.com/letamirebevanuw.pdf
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_da5786822bb44d42afb933096171e8a5.pdf?index=true
    • 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_off000105ea.bin
1c2f8f325523c690718f00d1215bc0d740bb3d17a72cc69d1eb177866e8fc704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105EA 5268 bytes
font_01_sfnt_off000117ba.bin
929800b459afc5fbce45e71c67827b54242d9bb3370a24b297adc204344899e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 12120 bytes

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