Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cd44160b45d9e8…

MALICIOUS

PDF

71.6 KB Created: 2021-03-23 13:07:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5de8bb3e4b329c52d9c108237c5adf97 SHA-1: ded3549d9d5eacbe32bd80d7e8a0ebd7ea4a6b5a SHA-256: b9cd44160b45d9e8bfbd030b1adde47f0634313a66cdca788ea711f9d1d9b5c6
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicative of a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to sites hosting further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9189

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://botokaw.ru/aws?utm_term=how+to+switch+from+2d+to+3d+in+autocad
    • http://kubosikavudux.mygamesonline.org/zapolaralafetil.pdf
    • http://fibiver.mygamesonline.org/dieta_aumento_de_masa_muscular.pdf
    • https://pulogumofus.weebly.com/uploads/1/3/0/7/130739416/tivowikise.pdf
    • https://kibidabusiben.weebly.com/uploads/1/3/1/0/131070702/3712934.pdf
    • https://birobidusizal.weebly.com/uploads/1/3/4/6/134638138/63dd88bfb30.pdf
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/9190614.pdf
    • http://vuzuwul.getenjoyment.net/samsung_tv_ir_sensor_not_working.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zolerazowubow/34538090858.pdf
    • http://jukasuxoseki.atwebpages.com/18598882811.pdf
    • http://bixozebaxikapos.atwebpages.com/becoming_raw_vegan.pdf
    • https://uploads.strikinglycdn.com/files/416b8d7d-509c-474c-be04-d838ce74bd9a/44792085650.pdf
    • https://uploads.strikinglycdn.com/files/a58bca35-07a6-4978-a23f-f3c1af0d0a85/puzasomi.pdf
    • https://s3.amazonaws.com/muvojugejoxip/64120779983.pdf
    • https://uploads.strikinglycdn.com/files/3a15d760-278e-42df-9e16-8cfcba56c770/what_are_some_cool_rap_names.pdf
    • https://uploads.strikinglycdn.com/files/0fccc6e1-7088-415a-8798-2165ed79e237/66473390579.pdf
    • https://s3.amazonaws.com/lososimap/corel_draw_x5_tutorials_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/2d6aaef0-6f34-4816-8a62-0fa8856f1a27/how_to_do_vedic_maths_addition.pdf
    • https://uploads.strikinglycdn.com/files/46bfb6ec-d4bc-4640-bc5a-ba33ace6d6d6/pokemon_fire_red_guide_bulbapedia.pdf
    • https://s3.amazonaws.com/wajibile/live_stream_tv_app_free.pdf
    • https://uploads.strikinglycdn.com/files/0ff12529-c431-4c63-9bd6-b3839d5ccc08/hp_10bii_financial_calculator_change_decimal_places.pdf
    • https://uploads.strikinglycdn.com/files/816f6ad6-0160-4ec9-9b93-8acbcf3d042a/omron_m3_intellisense_reviews.pdf
    • https://s3.amazonaws.com/sojuravewi/youth_worker_job_interview_questions_and_answers.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d4.bin
9440f71eefa4f59c7a71b16fb0b9f65724f2db68f71ee41650680a98f027c4b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 4032 bytes
font_01_sfnt_off00010545.bin
934143c17207d5e3febfac606e1d77b4cbcec92c86dd9188967e9d6c8a43574c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 5576 bytes