Malicious PDF — malware analysis report

Static analysis result for SHA-256 c352d37e072db00a…

MALICIOUS

PDF

75.5 KB Created: 2021-04-05 00:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58636538cc4832b18a6aa5f2e7db8ea0 SHA-1: 5edd7ccb81f2afa0ee98602ae6445751b5c88dbf SHA-256: c352d37e072db00a5649ec4bf93187b11b9dde8ac7a22576ae998898f7b7bbfc
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://baarspo.ru/strik?utm_term=venn+diagram+worksheet+answers+pdf PDF link annotation
    • http://decideyouself.fun/rotusavugilaniniromi7s1hu.pdfIn PDF document text
    • http://my-favshopc.online/jegadukukifew35hi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5fe9082e91e34.pdfIn PDF document text
    • http://blu-ital.space/36831538083lpvnn.pdfIn PDF document text
    • http://com-signto2.xyz/250709608206dpwv.pdfIn PDF document text
    • http://wozovumorawoka.sportsontheweb.net/27514064755.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373261/normal_5ff8aeafdd4eb.pdfIn PDF document text
    • http://3bureaureport.info/craftsman_18_electric_chainsaw_replacement_chainxg520.pdfIn PDF document text
    • http://businessmentality.com/zazimiji9wbzj.pdfIn PDF document text
    • http://lifegirls.site/tefopekomiwarikirexegazerbyls9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_600d69da474fc.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/present_tenses_upper_intermediate_exercises.pdfIn PDF document text
    • http://euroshopme.site/4603602168ev09x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406170/normal_5fe2d8732c1d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://radiviwix.onlinewebshop.net/proyecto_arquitectonico_de_un_centro_comercial.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/guest_folio_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/wordly_wise_3000_book_8_review_for_lessons_5-8_answer_key.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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 5544 bytes
SHA-256: ae10e3ac66171d881f9ce37a09cae614eb4b19d7d8a94fb524cfde16b948a4c7
font_01_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 10780 bytes
SHA-256: 15b48380765dae3d5522e33039ad0e0f1abf56ca9b7ee878b833dc5e7c548476

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