Malicious PDF — malware analysis report

Static analysis result for SHA-256 5721d0d48155c226…

MALICIOUS

PDF

73.7 KB Created: 2021-03-22 05:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: d4b5ac5f986a48d8756e4d2fd5ca7b19 SHA-1: 7f06af5df997cb79903faf86e25b0a1708224e46 SHA-256: 5721d0d48155c2260a77bc1bd26404b3c47274933b3a95e38f5f7d2feaac77d0
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This URL is presented to the user in a context suggesting a file conversion tool, likely as a lure to a phishing or malware distribution site. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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=outlook+file+to+pdf+converter+online In PDF document text
    • https://cdn.sqhk.co/bakimexatura/jhjddhj/zigofononiwesizaxug.pdfIn PDF document text
    • http://tawabuzawi.iblogger.org/24971520549.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/0ibgjjc/fruit_shooter_game.pdfIn PDF document text
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/zonusibebise.pdfIn PDF document text
    • https://rosififobagas.weebly.com/uploads/1/3/1/1/131164218/6a69e8961967f96.pdfIn PDF document text
    • https://gozogofina.weebly.com/uploads/1/3/5/2/135293272/3998154.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/fd05e84340e973f.pdfIn PDF document text
    • https://cdn.sqhk.co/vigeroti/icvShgT/illaoi_combo_guide.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/6094142.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/fofeguj/cheppave_chirugali_songs_doregama.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/ruvuvizup.pdfIn PDF document text
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_107f00694cb04235a6a81a2549cae9c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c7fce4-bd78-4f7e-a45f-5df1610396d1/71603913705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8305773-dc68-4621-b3e1-8e6fbc5cedde/will_kidde_and_first_alert_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f5ec7c-6eac-4217-b518-1c77972ae87e/gevazakaludabutiloxo.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/about_me_worksheet.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_313a8363f19e446191311cdf2b8119c9.pdf?index=trueIn PDF document text
    • http://ruvowepager.epizy.com/2768258353.pdfIn PDF document text
    • http://pinepukaxibitut.epizy.com/clinical_anatomy_moore.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/chevrolet_beat_2019_ficha_tecnica.pdfIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_5508786fcdc54ddda2dbcb873d413025.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavabi/jw_broadcasting_songs_lyrics.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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 4912 bytes
SHA-256: b63e31335a3d4754e63119744634b7ad425595379ceb80d769dac0d17945fe27
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 10700 bytes
SHA-256: 9b17442882a3182687494e69b2f06b3f1fd324b5e65f58dcfd70202ffe9428d9

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