Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c37b273adbad34…

MALICIOUS

PDF

68.0 KB Created: 2021-04-05 22:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1a73002dbc03bc45091bad5f020d589 SHA-1: 99e3af2f1e44ffa5a694c207c5ccff0af3178510 SHA-256: b4c37b273adbad346fbf8980f1570efd64739e077b72610add804c11f9d39339
96 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to malicious domains, as indicated by the ML classifier and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of external URIs and the overall detection by multiple security tools strongly indicate a phishing or malware distribution attempt.

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://nipisod.ru/wix?keyword=skills+worksheet+concept+review+answer+key+chapter+5
    • http://azakalaza5.xyz/free_online_english_grammar_courseb05td.pdf
    • https://nizakibete.weebly.com/uploads/1/3/4/3/134386075/1252604.pdf
    • https://lasuzolus.weebly.com/uploads/1/3/5/3/135315371/3d64643e.pdf
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/b8ecb3e249545.pdf
    • http://theporte.xyz/remogixarefe8n8qh.pdf
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/3444414.pdf
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/jojos_pigorisexitodev_redegefotitobox.pdf
    • http://gmetry.online/71487120708wbv61.pdf
    • https://kunipasufit.weebly.com/uploads/1/3/0/8/130874165/seboj.pdf
    • http://bipudal.iblogger.org/the_didactics_of_audiovisual_translation.pdf
    • http://private-channel.site/metejidululerqksg0.pdf
    • http://gobigs.space/gofijekuditivanee2mrf.pdf
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/zoloxatugijuve-nelov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://taxifegizuni.epizy.com/figure_of_speech_worksheets_5th_grade.pdf
    • https://s3.amazonaws.com/sinadi/dekosumerawad.pdf
    • https://s3.amazonaws.com/voxulija/what_is_meant_by_noting_of_bill_of_exchange.pdf
    • http://barovupaxar.epizy.com/where_is_the_samsung_refrigerator_water_filter_located.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_off0000ce4f.bin
f884a78dcde271099fa865dd1b7407ff552b7111d85ba251903d0f08a5e2c448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 5568 bytes
font_01_sfnt_off0000e15c.bin
d177e7f9afa07e1deea018130fff68d9e03938634b1d74e6dcc4dc2c32e4f167		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 9828 bytes

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