Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7850128c2064c9…

MALICIOUS

PDF

82.9 KB Created: 2021-03-29 06:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c8e3b6638c6e455f403fa005d30022 SHA-1: db411281231017e4e05f21882dc3bc812552835b SHA-256: 3b7850128c2064c982ee116bcc8b48cb69f6a143648b28455547c711a5f4bf54
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that leads to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'exercises pdf', aligning with a phishing attempt to direct users to the malicious URL for potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=should+shouldn+t+ought+to+exercises+pdf
    • http://rajajime.mypressonline.com/nebinedabixesimikineti.pdf
    • http://botavubapisod.mywebcommunity.org/how_to_bypass_icloud_activation_lock_for_free_on_ipad.pdf
    • http://wimuzawoxi.getenjoyment.net/47503928295.pdf
    • http://nubemeketetu.mypressonline.com/91352989085.pdf
    • http://nesorus.mywebcommunity.org/law_of_sines_and_cosines_quiz_part_1_quizlet.pdf
    • http://kimujedat.mygamesonline.org/how_to_solve_for_time_given_initial_velocity_and_distance.pdf
    • http://mipexalazalekab.getenjoyment.net/124939172.pdf
    • http://motarojetox.sportsontheweb.net/87799167467.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nozozuwovore.atwebpages.com/synonyms_and_antonyms_worksheets_grade_7.pdf
    • https://s3.amazonaws.com/tikoweravisixu/traductor_espaol_e_ingles_gratis.pdf
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_3be71364dce845aa92a76731676e4522.pdf?index=true
    • http://bumurulepowele.myartsonline.com/fijuz.pdf
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_226dbd36d05f4960af656bc858125f86.pdf?index=true
    • http://pelebirepopo.onlinewebshop.net/count_my_words_per_minute_typing.pdf
    • https://s3.amazonaws.com/numunenoji/financial_and_managerial_accounting_for_mbas_5th_edition_hardcover__2017.pdf
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_e7c08612af33403dba70a593fa865788.pdf?index=true
    • https://s3.amazonaws.com/borokegujuzero/vulifidib.pdf
    • https://s3.amazonaws.com/zarusegibitumet/how_to_screw_wood_planks_together.pdf
    • http://pesetunal.onlinewebshop.net/60413453401.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_a06b9695be4a4825850dfe0b626d6e5b.pdf?index=true
    • https://s3.amazonaws.com/falufusu/assistant_finance_manager_interview_questions_and_answers.pdf
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_0be45baa9cfd40dfa858a04bbfd7d829.pdf?index=true
    • 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_off00010520.bin
05fcfa8d5f0db6a1d5a6f2877082955a073ea30aed5eac04ee3bb02a19262a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 5380 bytes
font_01_sfnt_off00011771.bin
783f090ba5cf18081c67a8e53036a216717d9f569e54d691d1aef5530a783ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 10816 bytes

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