Malicious PDF — malware analysis report

Static analysis result for SHA-256 653c4e62fdaa309c…

MALICIOUS

PDF

89.7 KB Created: 2021-03-08 14:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7239707f36e5e6bcee2fa9ee6d252a3c SHA-1: ee111dc82e334b4c15520fd9cd254db237aa0266 SHA-256: 653c4e62fdaa309cfeab5f066b855455d07198426aebc567b678533f6be06da0
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a browser extension installation lure, indicating a social-engineering attempt to trick the user into installing malware. It also redirects to a known malicious URL, further supporting its malicious intent. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as Pdf.Phishing.Trojan. No scripts were extracted, but the embedded URL and the lure suggest the document is designed to lead the user to download and execute a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crophysi.ru/award?keyword=public+health+nutrition+cycle+pdf In PDF document text
    • http://monogawuw.iblogger.org/bird_song_identifier_app_android.pdfIn PDF document text
    • http://wiinorama.website/how_to_treat_breast_engorgement_when_stopping_breastfeedingbr4b2.pdfIn PDF document text
    • http://deseputageb.iblogger.org/flat_stanley_books_to_read_online_for_free.pdfIn PDF document text
    • http://pawaridifos.iblogger.org/nujepodofesasedemuregot.pdfIn PDF document text
    • http://snegny.com/charlie_puth_how_long_remixzqvvw.pdfIn PDF document text
    • http://waxokuvinati.iblogger.org/komanafonufomojezilelozon.pdfIn PDF document text
    • http://kelnoteres.xyz/anand_shinde_video_songs_freeo216p.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
    • http://zuwemanikipe.rf.gd/takewimosasixurajewowox.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/arya_malayalam_movie_hd_video_songs.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/genazinitofapejokor.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/pipuxunojunan.pdfIn PDF document text
    • http://rujatalunewu.rf.gd/practical_machine_learning_tools_and_techniques_citation.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/36680735320.pdfIn PDF document text
    • http://buvizukiwixo.rf.gd/7439855046.pdfIn PDF document text
    • http://pibedidijuk.epizy.com/turisiluzuledowivibedumi.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/logarithms_worksheet_with_answers.pdfIn PDF document text
    • http://wokoxut.epizy.com/charles_chaplin_tempos_modernos.pdfIn PDF document text
    • http://nanesipub.rf.gd/ruvasubeduvitujanonil.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_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 5188 bytes
SHA-256: 2ec1893d1b515bb56d768e0100a7445857d8cb6621fc8c0634604d16362273bf
font_01_sfnt_off00012777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12777 10548 bytes
SHA-256: 84bd0eb997da9979f7b9da2ef1ddc2950dd1849fdd59dbddb1d3d076509f0dd3
font_02_sfnt_off00014b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B79 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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