Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a48c3f9791e62c…

MALICIOUS

PDF

83.2 KB Created: 2021-03-26 08:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 295c29c3d51c5bbeaebcbe4ca6cf6713 SHA-1: b549488830a2db2d6625aead568d330a68cd952f SHA-256: 74a48c3f9791e62c679bf467b62d127f8ddbdfe58b2222e7153bc8ed93c8cb2f
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link disguised as sheet music, which redirects to a URL that is likely used for phishing or to download a second-stage payload. The presence of PDF_SEO_UTM_REDIRECTOR_LINK heuristic further supports this, indicating a free-download phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=lord+of+the+rings+piano+guys+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453560/normal_6011db1a3dccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fe859fe40d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_6026a462b6a04.pdfIn PDF document text
    • https://cdn.sqhk.co/gawisibiw/cjhMFiG/zamupinulurugetim.pdfIn PDF document text
    • http://pawosevisipe.iblogger.org/bnf_75.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/heBiiCg/mobile_phone_malayalam_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/ULXhhie/79995370153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fdb54ff06413.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/kiguteperilodu/newton_s_laws_of_motion_vocabulary_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/78394209144.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/gst_annual_return_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/what_color_wire_goes_where_on_a_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/39521806276.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/best_cv_template_word_pakistan.pdfIn PDF document text
    • http://savoziv.epizy.com/kinesiologia_holistica_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5a69f0-24d3-4d8c-af95-ac5defb49cb8/summer_infant_baby_monitor_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e6c7a3-852f-47a3-a3d3-7c68683d9ab2/casio_wave_ceptor_tough_solar_multiband_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24be2fd-9427-472f-8822-c87c459c3714/how_to_reset_photoshop_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07a651c-0cfd-4f1d-852c-57b1c8c421fa/how_to_learn_the_tarot_cards.pdfIn PDF document text
    • http://bajebozirodiv.epizy.com/justice_league_unlimited_theme_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/telugu_wap_net_banjara_dj_songs.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_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 5580 bytes
SHA-256: ae1a393ce446b883d72c8bacdfd6283be107b920b7c684e2cd5ca4c6befe4024
font_01_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 12360 bytes
SHA-256: 491c8069ba38c1a992db5665e953061f7582df14a51e9669f664d912f4b26db5

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