Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fef47ebf63e4d82…

MALICIOUS

PDF

88.7 KB Created: 2021-04-15 19:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f4ef2e365ceeb575d52182c7e5259b6f SHA-1: 59ed9dafad5db47a6138413e7e8de25daf5bf1fe SHA-256: 3fef47ebf63e4d82dae56929f0a7dcda02d610d8bd3d0aa1d750c962f040e33b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=short+moral+stories+for+kids+in+hindi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476140/normal_601d8c75274db.pdfIn PDF document text
    • https://cdn.sqhk.co/lixepupo/djcjggf/belden_9842_datasheet.pdfIn PDF document text
    • https://zenugewitewane.weebly.com/uploads/1/3/5/9/135960096/4841494.pdfIn PDF document text
    • https://mekebibarefuj.weebly.com/uploads/1/3/5/3/135335096/212d9f.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiliziv/8hggcds/21024128196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470961/normal_6043120ae905b.pdfIn PDF document text
    • http://finovadi.iblogger.org/37283294872.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://julizut.rf.gd/bivamisufopimiv.pdfIn PDF document text
    • http://navezep.epizy.com/vofifipalujumikazafarivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf05d77-d243-4f6a-8bef-d848b40936f2/bowajax.pdfIn PDF document text
    • http://vedirananu.epizy.com/kodalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77daef73-c816-4a1d-900c-b2ae82eaae0e/margaret_much_ado_about_nothing_character_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581e1088-d69e-41e3-92c7-52261cbb389b/wordpress_login_admin_not_working.pdfIn PDF document text
    • http://jojugabijogi.rf.gd/gusujiponitasasokiveworiw.pdfIn PDF document text
    • http://mapitixonemo.epizy.com/agnus_dei_free_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c713000a-73bf-4a67-a35c-3f606995b665/best_fingerstyle_guitar_tab_books.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_off00011ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDB 5312 bytes
SHA-256: 78cb09de97f5f6e64f7983a4c1e02fa49534529238bcb54906cbf89259f7e503
font_01_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 11260 bytes
SHA-256: 38b6c09a0ab4f8e5394a53105a547a34fe376049a5096586c1182811c15c5ead

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