Malicious PDF — malware analysis report

Static analysis result for SHA-256 f690550d1ef46325…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 05:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eb45a8a7678daa166086156a3f70e829 SHA-1: 2c82e7ca2d37050b22680e0950e05d1d5a371ca0 SHA-256: f690550d1ef463258e298d4beb89a509347216a152d7519419d145c5a55eb0e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of external URIs and the link farm heuristic point towards the document being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=simile+and+metaphor+worksheet+grade+4+pdf PDF link annotation
    • http://craftsmansmetics.com/cadivi_catalogzpe7n.pdfIn PDF document text
    • http://bunewasebawaxig.iblogger.org/sony_bdp-bx59_manual.pdfIn PDF document text
    • http://sotibubol.22web.org/bulletin_de_paie_vierge.pdfIn PDF document text
    • http://juwijosij.iblogger.org/circulation_acc_aha_guidelines.pdfIn PDF document text
    • http://myfavoritesun.xyz/event_flyer_template_powerpointgsjx3.pdfIn PDF document text
    • http://vosiwikaxipe.22web.org/94981915718.pdfIn PDF document text
    • http://puliliraforuwu.22web.org/autocad_plant_3d_2019_tutorial.pdfIn PDF document text
    • http://usesalle.xyz/vita_spa_error_code_ecqpyaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zumebixakefeta.epizy.com/new_formcontrol_custom_validator.pdfIn PDF document text
    • http://lezegunotoxom.rf.gd/platform_bed_queen_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22deda3a-0ce5-4e37-b5a6-15c78ae8a89f/twilight_saga_cast_and_crew.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/lovugulekigavope.pdfIn PDF document text
    • http://sopexas.epizy.com/47545958548.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/tascam_388_calibration_tape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fbdf458-de36-4167-b11b-b6ae7f5cdea0/bifutiwowikufovikafu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/61182504808.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/kasegarezi.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/arikil_pathiye_song_ringtone.pdfIn PDF document text
    • http://topawod.epizy.com/31496162121.pdfIn PDF document text
    • http://jowatazurusu.epizy.com/analytical_response_format.pdfIn PDF document text
    • http://redadut.epizy.com/intermatic_water_heater_timer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb376df6-3130-42f5-85c9-775547fbfd17/33463653320.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/flannel_sheets_crib_bedding.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_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 5800 bytes
SHA-256: 2688e52ca4a9a30227c344dec59ebfd40f6eccb20547fc8799daf11b25f1334f
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 10992 bytes
SHA-256: 05ad9249e1c37cd16b94846da57c5ec4383d2095b68eba80e2383f7bfbf5b646

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