Malicious PDF — malware analysis report

Static analysis result for SHA-256 79af1c74920ddf30…

MALICIOUS

PDF

78.7 KB Created: 2021-03-29 04:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1887f65303ec14255e7b4b76543c837c SHA-1: d090a7400f6920a736da5862f3fe2eeec50e87a8 SHA-256: 79af1c74920ddf3029939f03b300379fc3ab4f1ee2ba2cee43607260da86bbb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as legitimate resources like worksheets. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/award?keyword=bohr+rutherford+diagram+worksheet+pdf PDF link annotation
    • https://wiruxunuv.weebly.com/uploads/1/3/5/3/135324042/5351260.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/wuwijev-kipamel-tarosesasozomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_6041ef0170919.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_6005921a654b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494452/normal_6006868b9a81a.pdfIn PDF document text
    • https://zotejukewas.weebly.com/uploads/1/3/5/3/135347558/b28b12ab9007d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/benubapopikaj/anybody_can_dance_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/62576766378.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/12179940127.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/yamaha_hs8_subwoofer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/button_click_animation_android_studio.pdfIn PDF document text
    • http://matefurixexa.epizy.com/how_to_change_my_start_page_in_microsoft_edge.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/67802970028.pdfIn PDF document text
    • http://lesunew.epizy.com/memaruporagomuraruf.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/84002582646.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/free_top_music_ringtones.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/27416651010.pdfIn PDF document text
    • http://baponexar.epizy.com/87992427094.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/wufafijobemebometiv.pdfIn PDF document text
    • http://sidegiri.epizy.com/67571138210.pdfIn PDF document text
    • http://dadewom.epizy.com/jesus_loves_me_piano_music_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 5404 bytes
SHA-256: 0da8b074cfe76dc2056953d0effb70704637233b986a8bd8ef510f27c3ccdbc3
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 11476 bytes
SHA-256: be47e04e46864df1567b2aa7ea0841cae071138dc99bda90df1444a835384c4e
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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