Malicious PDF — malware analysis report

Static analysis result for SHA-256 260a2907018db7d2…

MALICIOUS

PDF

88.1 KB Created: 2021-05-26 03:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 28b3c48f756626b144bdc35af502aeb1 SHA-1: 44e9f43518b22b8b3771bba9a54ff6f758551444 SHA-256: 260a2907018db7d20e1a4eba879636583a08e521a25e84be4e33fe7f7363ce1f
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely part of a phishing campaign. The document body, though heavily obfuscated, contains text related to 'Mejor banco de puerto rico', reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/strik?utm_term=mejor+banco+de+puerto+rico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4530151/normal_60256422e5040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6055cf78da871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373008/normal_6015d8a803ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_6066fdfb94805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_6037f8c4b050c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_601f1d43490d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_602bb43d68433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_604b68707e807.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_5ff77b11cbf08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_6036071bca338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384149/normal_5fe38d00c6dc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5fff4dca0983c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_6052f4c3f08bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xixonu/how_do_i_reset_my_sub_zero_ice_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6c5818-fc78-4935-aa9e-10be42ff0676/sing_gary_barlow_lyrics_music_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d443ed1-c12e-45d3-a6c0-e0b6c5529bb0/super_metroid_escape_2_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298dc354-dee9-4bca-aa9c-7ed0b1680ea9/invent_your_own_computer_games_with_python_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e67e7c-8516-4dd7-b5f1-9bcecd5f44f5/vogetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b0969df-22cc-4829-8390-71b1bc4a7b4d/bimegujiwavom.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/avengers_4_trailer_mp4_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df1af264-04c5-4d7d-8de7-86aea23b2024/what_does_e9_mean_on_a_hisense_dehumidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e80528-5384-422e-a35c-6f810b7ec32b/72603061076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db04c857-1162-44b3-9fbb-2031227c34ef/2017_dodge_ram_1500_accessories_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104d9887-1192-4be4-a664-d709ac0108c7/sorevenaxawogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df24dc0-5590-4fcd-b31d-b0bb28a48297/lusigusebamatifado.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A72 4960 bytes
SHA-256: 4b431834f38dda10808a3c568592adb00a861a7cb6203147918a14cedc32e820
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 12068 bytes
SHA-256: f539c58295e678e296e1c673674c7ca728dda0524e1c4e48c5ee07b47239c9b6
font_02_sfnt_off00014328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14328 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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