Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9397ffa791c2d2…

MALICIOUS

PDF

113.4 KB Created: 2021-05-27 22:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9417a545dfcae0f4bbf742d13994acac SHA-1: 74be870a664f4bfe2100abcc497e3fccce7833d8 SHA-256: fe9397ffa791c2d25110807ad55e9ef34fed1f65a1c2bdeffdea1c2ab6e0edfd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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.
  • 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://resalured.ru/strik?utm_term=project+management+report+sample+construction PDF link annotation
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/najek_xadipadanefa_lamubafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_602e397fc5bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_6057c5f5e9869.pdfIn PDF document text
    • https://wavixupenug.weebly.com/uploads/1/3/4/3/134386336/zunef_lozuzokufodivek.pdfIn PDF document text
    • https://zefilezagomi.weebly.com/uploads/1/3/4/4/134474677/5178293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_6040085a9649d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379614/normal_5ff611f418e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410702/normal_600a771e46195.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476294/normal_602d30948b876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60488c830165b.pdfIn PDF document text
    • https://bavexopifepixab.weebly.com/uploads/1/3/4/6/134683122/b51e40ac304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fe8637ac77ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_5fd69f6ebcb4f.pdfIn PDF document text
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/2949450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81b1128-31ed-462f-b0ab-d9e4c50421c5/68409529240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7452a51c-19f2-463d-bf89-49a8ec39637d/manual_para_tocar_guitarra_acustica_para_principiantes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/602cba8e-47e4-4625-b568-0a42b80301c3/how_to_fix_samsung_s8_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea63a6ae-e472-48c0-aab2-e768aee1d105/descargar_el_libro_del_coran_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b4b481-5952-4853-ba53-8912c0be5ba1/68635555028.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_off00017ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EE4 5328 bytes
SHA-256: 19547101aff02d1e0c796883711d9c6227b74eb9b2c19c55c730489b3fa07d6c
font_01_sfnt_off000190f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190F0 11436 bytes
SHA-256: def6af0e3f02998f84fe355b26f73a654a857f82fb6e2d3a70b052d0183d28da

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