Malicious PDF — malware analysis report

Static analysis result for SHA-256 4261740c5888323f…

MALICIOUS

PDF

81.0 KB Created: 2021-05-06 17:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 570031886b44ff6501282ec20355dc5d SHA-1: 7d21743642fb3d09db2b6e1b8e88d2ecff1e9851 SHA-256: 4261740c5888323f5c74188b402c2ca3555e47165a84e0b5d9167c75e90327cf
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to a Samsung manual, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=samsung+hw-h550+instruction+manual PDF link annotation
    • https://cdn.sqhk.co/dasofuduveje/ajfqo9S/bofezimoj.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/42145957046.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumabigige/jd4CWih/58590221625.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/UoRBihf/77078680187.pdfIn PDF document text
    • http://gijaninapumobe.sportsontheweb.net/35537062967.pdfIn PDF document text
    • https://cdn.sqhk.co/kevamubeminu/YijOO8F/51117542989.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/oibhdhd/34454250094.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/idhfuvy/tebowujuterodadosawowige.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jagaEjj/sci_fi_movies_free_download.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/644affb1-cd33-4f42-9b2f-a20af929357e/bomimapinujigutevoxelotak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559e2d3e-cf6f-43b2-a6b9-b6ca811b1b57/what_food_is_good_for_bulking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a026cab-6fa9-44d5-b4e9-8117874ebbf7/35226949137.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/apa_format_references_example_journal_article.pdfIn PDF document text
    • http://sizemogigu.myartsonline.com/83770527509.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/biology_encyclopedia.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/25323845486.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/tekazakowojoso.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/cctns_system_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/how_do_you_unfreeze_a_samsung_ice_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/songs_2018_and_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb612a4-fa34-456e-922f-d2877fc83952/my_gas_range_wont_heat_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2067c48-c4fa-45c5-8f0d-52e0213b90b7/introduction_to_flight_john_anderson_7th_edition.pdfIn PDF document text
    • http://duvodix.myartsonline.com/can_you_take_the_written_driving_test_online_in_mississippi.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_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 5708 bytes
SHA-256: f5678885d961c035667e157feda596c24ff852a4fa60d8f01779380b4fc117d4
font_01_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 10956 bytes
SHA-256: ae632941b4df5512a2d5de80ec1d029d6935954a1d6c3cc41237c18b433766a4

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