Malicious PDF — malware analysis report

Static analysis result for SHA-256 3835b0176d71198c…

MALICIOUS

PDF

73.9 KB Created: 2021-03-25 09:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1acdce1e86945f351098dd3d7bfb0ed2 SHA-1: b213c6044b7b1bac389049752d91eb706d679bce SHA-256: 3835b0176d71198c440be5758004578158bf2c925121593a90e9a7cef3d1641f
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'https://midufefew.ru/wix?keyword=freshdirect+refer+a+friend', which is likely a phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the overall detection suggest an attempt to redirect the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=freshdirect+refer+a+friend
    • http://durasazi.iblogger.org/cabinet_d_avocat_guide.pdf
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/vimilevezujez.pdf
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/9372545.pdf
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/misumavewitoremirobo.pdf
    • https://puzilefamurujuz.weebly.com/uploads/1/3/2/7/132712080/07252.pdf
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/7666283.pdf
    • https://bubigijezifaju.weebly.com/uploads/1/3/1/3/131380429/4954916.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wizuluworafid/how_to_replace_batteries_on_first_alert_smoke_detector.pdf
    • https://uploads.strikinglycdn.com/files/292c6e18-414e-42ae-9ba0-61f1e2bf5e07/pizzeria_da_gloria_seftigen.pdf
    • https://uploads.strikinglycdn.com/files/c925328c-2d22-4327-965d-009f319512b1/gluten_free_dairy_free_snacks_for_toddlers.pdf
    • https://s3.amazonaws.com/waduzirader/43647041175.pdf
    • https://uploads.strikinglycdn.com/files/d73c44e2-ec48-46fa-8f49-b69ac5f026d1/how_do_i_stop_being_negative_at_work.pdf
    • http://supipagaj.epizy.com/effective_brainstorming_techniques.pdf
    • https://uploads.strikinglycdn.com/files/10d03e4c-bf17-41cd-9b10-e68b1f67ebce/krk_rokit_5_price.pdf
    • https://s3.amazonaws.com/pujirageg/server_icon_template_minecraft.pdf
    • https://s3.amazonaws.com/buponuwebi/summary_of_the_book_diamond_of_darkhold.pdf
    • http://talagamezibupip.epizy.com/kapinofilez.pdf
    • http://reluwiz.epizy.com/greeting_card_templates_free_printable.pdf
    • https://uploads.strikinglycdn.com/files/be98ce7e-f401-4e1b-9d0a-f935487388ef/gopro_hero_4_silver_manual_portugues.pdf
    • https://uploads.strikinglycdn.com/files/9d35e636-5406-4a63-a9ec-f6aa6f4a59dc/rufosomalajozoramano.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_off0000e2cd.bin
381d4747fc3e0be66ef2594c3f8ea5bb279d2184e6458d766ace536b7201a0b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CD 5032 bytes
font_01_sfnt_off0000f3e4.bin
4fae91da6f31aed3c9c10c4348c31146ee94823b8651dda95c2eb4c0d9304c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 10736 bytes

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