Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4bd00106841fa0…

MALICIOUS

PDF

253.3 KB Created: 2021-05-21 00:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a0f51115be13fa2df31c9636e749e2fb SHA-1: 2d1ba3b84f4723af3d87fef7dddbdfe2fb232886 SHA-256: 8c4bd00106841fa0508976d62ffba85ab59746c244696377d2a9eb5e1e98dc6a
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a payload or visiting a phishing site. The document body, though heavily obfuscated, appears to be related to installation guides, suggesting a pretext for the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lozipotod.ru/strik?utm_term=cisco+unified+attendant+console+advanced+11+installation+guide PDF link annotation
    • https://pusakinadolelu.weebly.com/uploads/1/3/2/6/132682110/ab948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fc7545f89b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_605de51c3c949.pdfIn PDF document text
    • https://soxokelu.weebly.com/uploads/1/3/4/4/134494323/gamupewajabuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456676/normal_6017ac868c787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446921/normal_5fca82d4e26c7.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/e0e2d187-d026-4d20-aa83-c4eb2f9becef/best_wireless_keyboard_and_mouse_combo_for_mac_mini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99589c9-4df1-4dc0-948e-2a7c1adf3fb6/jack_and_the_beanstalk_the_real_story_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/636fe29b-e7ef-45a7-9ed6-cab6e0729149/75308115729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212e5815-bbc9-40ea-b529-54fbd9cee2a7/how_to_connect_soundbar_to_tcl_tv_using_optical_cable.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/70555584771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64c03c75-20a1-4b88-bb58-4bfe3d098833/dd_delivery_llc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b1d86e1-14b4-4eb7-a78f-6f5c519d0819/how_to_remove_salt_water_chlorinator_cell.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/can_diabetics_have_complex_carbs.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/18263054578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630e955f-a95b-445b-a533-ed20a6e33e08/47811057116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd9f105-8b70-44e0-bce6-340b69412732/oracle_sql_advanced_select_statements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317c755d-ac5c-4202-b38f-2e12859d985c/goal.com_live_scores_champions_league.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_off0003acfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3ACFE 5112 bytes
SHA-256: 5515a0a3da33236e375adac69fa71b11b22bafa5cf8f35fe1cee3ed62dc9e2e6
font_01_sfnt_off0003be8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BE8A 11584 bytes
SHA-256: 9d6ef311ac6cd56b2fc70dfb90084d561c69546972cbf5e1f322b60b878df0e4

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