Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5f55a228a8e023…

MALICIOUS

PDF

79.9 KB Created: 2021-03-15 05:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a70d9b2ff8116d11adb9108dbf1ad89a SHA-1: 5070c468659964a2dd0ca837c21139bdb0b2b787 SHA-256: af5f55a228a8e023672dc1fee2bd63664ee823de67a7332d4a3f2562671a8c00
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 'dafemum.ru', which is presented as a free PDF assembler. This URL, along with other suspicious URLs found in the document, suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and embedded URI are strong indicators of malicious intent.

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://dafemum.ru/award?keyword=assembler+plusieurs+pdf+gratuit
    • https://cdn.sqhk.co/nadetajagupe/4EJiehe/lubinebanejeposaruzu.pdf
    • http://tusiteguluvora.getenjoyment.net/tasimukokurazikezo.pdf
    • https://cdn.sqhk.co/pixazizaze/hijb4QD/93223411390.pdf
    • http://supusatode.sportsontheweb.net/tabla_de_alimentos_con_hierro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nafoxuda/social_media_vocabulary_worksheet.pdf
    • https://s3.amazonaws.com/gezetega/88086800162.pdf
    • https://uploads.strikinglycdn.com/files/dd341bb4-522b-4c70-b91f-d2f41dba87fc/micro_expressions_book.pdf
    • https://s3.amazonaws.com/mogipegi/vivajo.pdf
    • https://uploads.strikinglycdn.com/files/7a296597-ab27-49dd-9136-316a31f982ee/download_driver_audio_hp_pavilion_dv5000_windows_7.pdf
    • https://s3.amazonaws.com/bakoloj/burnham_gas_steam_boiler_prices.pdf
    • https://s3.amazonaws.com/wovigebi/wijakozikinixut.pdf
    • https://uploads.strikinglycdn.com/files/85745e10-8861-44f5-8a93-f6aaec60c618/7297337973.pdf
    • https://s3.amazonaws.com/nowokil/oracle_sql_experienced_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/95574246264.pdf
    • https://s3.amazonaws.com/gagagakigibapo/bcbs_of_illinois_aba_forms.pdf
    • https://s3.amazonaws.com/kukupunopedon/63423286611.pdf
    • https://s3.amazonaws.com/vutame/99525778368.pdf
    • https://s3.amazonaws.com/jobavo/blade_mlp4dsm_mode_1_and_2.pdf
    • https://s3.amazonaws.com/mekonulegipero/analogy_notes.pdf
    • https://s3.amazonaws.com/desekusoxi/76967211708.pdf
    • https://s3.amazonaws.com/venunamazozuzo/23076970500.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb0.bin
8decaf7859c48e581d805c5de6358b2407c422f3abf4533dcf09d84e686c0926		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 5156 bytes
font_01_sfnt_off0000fd2b.bin
fb5475b6ab9b54554a493c1ea17bdccd4e792c1b1aab1f5c406abd2a78643e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 12192 bytes
font_02_sfnt_off00012467.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 4324 bytes

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