Malicious PDF — malware analysis report

Static analysis result for SHA-256 c657ebebb291969c…

MALICIOUS

PDF

86.5 KB Created: 2021-03-01 05:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7920fe93118ad0b12d136ff104e73c1f SHA-1: 4bf5ec0134d63291c2909877647f03746607aa01 SHA-256: c657ebebb291969c1cfa1b5a0d58cb714b8e0b2f9ecb9fb7dc52bf6d60bd924e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, disguised as a workbook answer key, is a common lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it may leverage embedded JavaScript or other mechanisms to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/wix?keyword=swimming+merit+badge+workbook+answers PDF link annotation
    • https://cdn.sqhk.co/nasubivapu/hggegiJ/amazon_cdl_driver_pay_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/bGsH8w4/jump_on_it_song.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/wozagixinituweketu.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/aJEOTjf/christmas_tree_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/3Lhhfji/podcast_addict_app_keeps_pausing.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/staph_epidermidis_bacteremia_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/iflHjbf/hopper_recipe_minecraft_1._14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gerekuvuburase.epizy.com/3102220647.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/beechwood_school_slough_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/hoover_vacuum_uh70120_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/trados_groupshare_2017_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/88574048841.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/1256766762.pdfIn PDF document text
    • http://laxuzakefojo.epizy.com/camilo_y_evaluna_boda_votos.pdfIn PDF document text
    • http://vamagirizotaro.rf.gd/6828941820.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/63635800765.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/kizadabivovazexuxeno.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/16352156438.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/36879907289.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/auto_start_remote_starter_manual.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_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 5512 bytes
SHA-256: c6be79fb1e7c9ba9672d0da8672313f05d7f4be4809ee89df1c5d3b30ed2d913
font_01_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10240 bytes
SHA-256: dd2344de4654376d41c33d979c8edd82a8ebf563245ae1f3b3aea83712051385

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