Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2e0a112d772920…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 20:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00dc7fde154a8b42603f15a3da046d21 SHA-1: e73c23b4239c2405bae929d742fc9479eaef43d7 SHA-256: 8d2e0a112d7729202e9d194419d16b700770a3a1f6e5914cb526de1292a704c4
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain. Heuristics indicate the presence of external URIs and a ML classifier flagged the PDF as malicious, consistent with phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'radiation pneumonitis pdf'. No scripts were extracted, but the primary attack vector appears to be directing the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/award?keyword=radiation+pneumonitis+pdf
    • https://cdn-cms.f-static.net/uploads/4365621/normal_605ef951c820b.pdf
    • https://cdn.sqhk.co/fepexeguma/epXViaD/lepiresalomawepikeb.pdf
    • https://static.s123-cdn-static.com/uploads/4383470/normal_5fcd50f249d9a.pdf
    • https://cdn.sqhk.co/zifiguwosu/Ciahhjd/auto_reply_text_message_iphone_example.pdf
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fc96d112e665.pdf
    • https://cdn-cms.f-static.net/uploads/4495399/normal_6062fe4d5e202.pdf
    • https://cdn-cms.f-static.net/uploads/4464722/normal_600b60d52815b.pdf
    • http://mezunirobuf.22web.org/que_medios_de_comunicacion_existen_en_colombia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jozaponi/35070774348.pdf
    • https://s3.amazonaws.com/tolivajupeku/90959100975.pdf
    • https://s3.amazonaws.com/jinabom/find_differences_in_2_excel_spreadsheets.pdf
    • https://s3.amazonaws.com/kesumasaka/el_vendedor_mas_grande_del_mundo_resumen_cap_1.pdf
    • https://s3.amazonaws.com/gopifu/craftsman_air_compressor_accessory_kit.pdf
    • http://zuriromaruwo.epizy.com/what_are_the_three_billy_goats_gruff_names.pdf
    • https://s3.amazonaws.com/pekatikisuruki/wejom.pdf
    • https://s3.amazonaws.com/saxefi/reverse_image_search_android_app.pdf
    • https://s3.amazonaws.com/vavejijitatofu/how_to_prime_a_jet_well_pump.pdf
    • https://s3.amazonaws.com/woberiz/forearm_bone_crossword_answer.pdf
    • https://s3.amazonaws.com/vabemavuputenif/karma_bhagavad_gita_quotes_in_tamil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18c.bin
6d2a9cd56711a34b88aa88c83445b52475cc0aaf180fa82bc90a4cbcf5c65187
pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 5068 bytes
font_01_sfnt_off000102c9.bin
dd83c49996eec16e503bdd89b5252aabd7917cc43fcd2299975141849a56c3b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10448 bytes