Malicious PDF — malware analysis report

Static analysis result for SHA-256 941d5cd2881aefa7…

MALICIOUS

PDF

70.2 KB Created: 2021-03-10 21:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f22cae57a04b6b45f4d9d07384836209 SHA-1: d88712409bc2711eddca272432a43c61a47d5dcf SHA-256: 941d5cd2881aefa71dede9213d5105e01bf18c369146199873b8a4e7b9565e5a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary malicious URL identified is https://baarspo.ru/wix?keyword=a+practical+guide+to+contemporary+pharmacy+practice+and+compounding+pdf, which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://baarspo.ru/wix?keyword=a+practical+guide+to+contemporary+pharmacy+practice+and+compounding+pdf PDF link annotation
    • http://tomorubi.22web.org/assistive_technology_assessment_form_ndis.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/house_of_night_otherworld_books_in_order.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/tecumseh_mower_engine_surging.pdfIn PDF document text
    • http://dutipajito.22web.org/humminbird_helix_5_di_gps_g2_manual.pdfIn PDF document text
    • http://ritixibetono.mygamesonline.org/star_trek_enterprise_tpol_decontamination.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/piroxoxalukinelabasofu.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/wujapu/momanudinakakidu.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_d9a0053bc7124983ba9385e69545d369.pdf?index=trueIn PDF document text
    • http://sevetise.rf.gd/le_petit_prince_chapitre_16_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/8630369236.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/what_is_the_difference_between_plan_elevation_and_section.pdfIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_65f55feed3f947b191674f5962fc9f6f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/vmware_esxi_6._0_u3_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/essential_of_statistics_for_the_behavioral_sciences_9th_edition.pdfIn PDF document text
    • http://godavuvexo.epizy.com/how_to_workout_for_mass_and_strength.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_74e7cda4088e46809f82be95cfe9e413.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/formation_of_bile_pigments_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/como_curar_erupes_acneiformes.pdfIn PDF document text
    • http://punumakiwibase.rf.gd/kowebasifox.pdfIn PDF document text
    • http://novufojanaka.epizy.com/40367116748.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/forest_birds_sound_effects_free.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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 5480 bytes
SHA-256: bf9a12100e6f400b92d590a23851b190c93a15461e1e0e51c75dc02f214fd8fc
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 9880 bytes
SHA-256: 55af78c67e0e33bc4dd6aac2a2f1b165d6455bb6abda45a9458899e0a60a4293

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