Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5a9810b23a7a6c…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 13:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a749951b0c2df10e1470cdbace0460a1 SHA-1: d0ea3f00c6d0699c00056f1fefec286417a8c72b SHA-256: 7c5a9810b23a7a6c7dc72d9ea0213710ac9ff0b08bbeaa0d6838f9982fa1f97a
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 ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://kuzutuzo.ru/wix?keyword=rucoy+online+beginners+guide', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Rucoy online beginners guide' and 'wkhtmltopdf', indicating a lure. No scripts were extracted, but the presence of external URLs and the overall detection suggest a phishing or malicious content delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=rucoy+online+beginners+guide
    • http://liketime.online/dodge_dakota_parts_catalog90nax.pdf
    • http://safodimim.iblogger.org/3ds_rom_for_citra.pdf
    • http://hookup153.online/easy_ukulele_songs_for_beginnersmpu9m.pdf
    • http://dhl-order.info/abecedario_hebreo_traducido_al_espaolfncgz.pdf
    • http://hookup158.fun/2019_air_force_pay_chartyais2.pdf
    • http://bugepugatoj.22web.org/what_is_the_theme_of_the_bluest_eye.pdf
    • http://kneeksi.ru/7697241195293821.pdf
    • http://lnstagramoriginal.com/where_to_buy_electric_hammer_gung8mon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mogipegi/67078812804.pdf
    • https://uploads.strikinglycdn.com/files/065a548e-0020-43e8-a161-3ce29579be0a/ziraper.pdf
    • https://uploads.strikinglycdn.com/files/e164e042-e826-4db4-8f30-a9037ce99930/how_tall_is_king_seven_deadly_sins.pdf
    • https://s3.amazonaws.com/foneniz/nanostation_loco_m2_firmware_6.1.6_download.pdf
    • http://sazojojuw.rf.gd/29904602205.pdf
    • https://uploads.strikinglycdn.com/files/96a94e3c-da3d-4ffa-b3e3-ae404e1eed24/gopaxagup.pdf
    • https://s3.amazonaws.com/pazovugal/where_are_englander_wood_stoves_made.pdf
    • https://s3.amazonaws.com/tibitexil/con_duong_viet_nam_lyrics.pdf
    • https://s3.amazonaws.com/xijalovelokolep/alegreya_black_font_free.pdf
    • https://s3.amazonaws.com/jukoxisojow/83444825392.pdf
    • https://uploads.strikinglycdn.com/files/e9f3c2b5-df41-4f73-b824-eb8afef4868f/iatf_16949_internal_auditor_training_ppt.pdf
    • http://tuvaditeli.rf.gd/95279008449.pdf
    • https://s3.amazonaws.com/polexebuj/11876430600.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_off0000fc59.bin
ec38d448d308a2e08f2ae68e8b155c5bb38be287931bd4c08d6765c6183f73f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 5148 bytes
font_01_sfnt_off00010df8.bin
e1ac7ec1eed5b8be18ceff5b5e1b99c621c34103d88370b4a2539305cfdb94a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF8 10708 bytes