Malicious PDF — malware analysis report

Static analysis result for SHA-256 273b6e80f942e5b1…

MALICIOUS

PDF

75.3 KB Created: 2021-05-29 14:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 261ca9f2b9b5e25806e71e5361e564c8 SHA-1: 226d6ccef7a8d79551f6eca5d6729ada3d6a4b8e SHA-256: 273b6e80f942e5b1f0753ce4c719ddd36a454228c71c7bddb86931fa603681ac
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational materials. The primary IOC is the external URI pointing to a suspicious domain, likely used to host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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
  • 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://xajibur.ru/strik?utm_term=cambridge+primary+english+stage+5+learner%2527s+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450430/normal_6069f88606981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_6011d3f187bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_604654ff8041d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_6036fbc8d3c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_604ad08416bec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_602d4ba2af258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9723af6a-70b5-4262-a9ab-93db5ff87f9f/67605930550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a943cedd-a716-4c09-a547-0e18ab8ff7bc/kimaliselarikewila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622e2589-8306-4c0e-baab-071bab1e646a/93962776559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4c2a25-0d89-4b6f-84b0-3a3676a913bb/wibowulatovope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaab050-8695-451e-a9b6-1b0ef18e3883/best_figure_drawing_books_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ddefb5e-05fe-485d-bfec-7dad661d4ab6/zusog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43936992-4cdc-4571-a0b4-301378fbc117/nietzsche_schopenhauer_as_educator_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0802541-8fc7-4cd2-a584-a7f969ca1913/how_to_do_songwriting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57742775-aab5-4616-8135-843c4886ec0a/what_can_i_do_with_a_real_estate_salesperson_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f561deb5-68fe-4f13-acde-5561edad7be2/fatuvusulelivefuleviman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/090f2370-0785-4b0b-bbdf-33695c94570c/how_to_prank_call_someone_with_a_different_voice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87940e8d-93cc-4935-9c16-741385259dca/tipos_de_archivos_digitales_mas_comunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9ff692-1c00-4f5e-b75a-56d076cbe3ce/why_does_google_maps_freeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b508c71-8345-4875-b0ee-6c6145097b5b/lamagorexes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4adf628-a392-4ce2-94a3-23908dc9ec26/download_video_bacaan_al_quran_30_juzuk_merdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0f40ce-5043-4d3b-b6c6-da3e4f856d08/free_download_mediatek_usb_vcom_android_drivers_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50acb547-bfad-4847-962f-7ab1a6a2792a/tennis_coaching_near_me_for_adults.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f64d97c-f0ed-435c-b33c-1ace7cc07872/82196215397.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_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 5824 bytes
SHA-256: 4cf46808eaa9b3946b74168e4ab92cd45107318b8978b9ee81d4a0d9f8b72107
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 10312 bytes
SHA-256: 39a88b744eda9649b8cd6ba53078526a9d2c524c5b2e92fef461fdd52d6a54ed