Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbd322b82da646d…

MALICIOUS

PDF

68.5 KB Created: 2021-04-08 08:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e09a2a18cd9afbaa70a054a89451e16 SHA-1: bcceb80d58048cd70eee679af4da9ebd9144bc75 SHA-256: 6cbd322b82da646db0ef4710ce32ba4da00a77030dddc36c6c4bda2d8380fab5
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'Karyotype lab answer sheet'. No scripts were extracted, but the presence of external URIs and the overall malicious classification strongly suggest an attempt to deliver a secondary payload or phish credentials.

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://kuzutuzo.ru/wix?keyword=karyotype+lab+answer+sheet
    • http://leaninrzpd.site/how_to_apply_for_a_drivers_license_in_massachusettsr9gu5.pdf
    • http://nesorus.mywebcommunity.org/magutelasow.pdf
    • http://khanapoorti.com/sao_episode_22_english_dubhoeui.pdf
    • http://gutibefatidag.medianewsonline.com/19450956217.pdf
    • http://mavito.online/tanki_online_crystal_generator_no_sua234u.pdf
    • http://dorulezebum.sportsontheweb.net/its_never_easy_to_walk_away_let_him_go.pdf
    • http://womuvizitina.mywebcommunity.org/toefl_sentence_structure_test.pdf
    • http://buxeletifexid.medianewsonline.com/87685076343.pdf
    • http://filuxunokenobud.mygamesonline.org/al_ahram_friday.pdf
    • http://somubuzesixuwun.getenjoyment.net/how_to_read_large_numbers_in_english.pdf
    • http://bugiwuxad.medianewsonline.com/boy_erased_script.pdf
    • https://cdn.sqhk.co/valujoper/ihf9wgd/venture_capitalist_switzerland.pdf
    • https://cdn.sqhk.co/vegeboranida/O1ijh9z/95726641931.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gagolabirej.atwebpages.com/catalogo_avon_7_2020.pdf
    • https://s3.amazonaws.com/zikeko/peter_van_houten_an_imperial_affliction_book.pdf
    • http://negumigimewote.onlinewebshop.net/43130067289.pdf
    • http://sodowurivav.onlinewebshop.net/sajiduf.pdf
    • http://pekiluji.atwebpages.com/arabic_translate_to_english.pdf
    • https://s3.amazonaws.com/tomamujuf/search_engines_name_list.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_off0000d1de.bin
76678a877dadb56a425525a963f043fe7baf3e2667877e503825bee7de798f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 5208 bytes
font_01_sfnt_off0000e3a1.bin
864485c8fb3521c89323d46ba8888ef18f3f741fc780b582bb6c65a75d95f243		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 9960 bytes

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