Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aac13f165b29863…

MALICIOUS

PDF

79.6 KB Created: 2021-02-28 02:46:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 60debdc09f12474675efb5b157c8a4e0 SHA-1: f36a8e73a56735ff1d998842ee31756932fc08fa SHA-256: 2aac13f165b2986322fd94620315ba0b25748c8744cd4f39ffed84e2adb7dea4
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating the presence of external URIs and is flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, appears to be related to interview questions, suggesting a social engineering pretext. The primary malicious URL identified is https://leonvi.ru/aws?utm_term=service+desk+analyst+interview+questions+and+answers+pdf, which is likely used to deliver a secondary payload or redirect the user to a phishing site.

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://leonvi.ru/aws?utm_term=service+desk+analyst+interview+questions+and+answers+pdf PDF link annotation
    • http://vemasujananexu.22web.org/yalla_shoot_apk_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464722/normal_5ff0d2f8bcc49.pdfIn PDF document text
    • http://difijeso.iblogger.org/sojizusumesubolalebeku.pdfIn PDF document text
    • http://zobebukore.22web.org/angular_7_component_inline_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/juniper_switch_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/identifying_integers_on_a_number_line_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/65505357327.pdfIn PDF document text
    • https://s3.amazonaws.com/bagokiko/game_pokemon_sword.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/call_of_duty_mobile_apk_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/dusaz.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/9207305034.pdfIn PDF document text
    • http://depezure.epizy.com/bible_dictionary_app_apk.pdfIn PDF document text
    • http://xibunagevidaze.rf.gd/chicago_marathon_tracker_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/76744667322.pdfIn PDF document text
    • http://zeropolawe.rf.gd/feriwenosegugunufukek.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/anecdotal_records_advantages_and_disadvantages.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/free_goal_setting_worksheet_for_middle_school.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_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 5696 bytes
SHA-256: 36772c09190752ea1080a2dc54d8a37d3981119f9fa3f3f60ed4a9b5c32c11d4
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10648 bytes
SHA-256: 3378378c7965a74a3059cbcc3bd07b169fe0cdca0a80c5923328bbfa35cb670a

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