Malicious PDF — malware analysis report

Static analysis result for SHA-256 397f250fec1a5c7c…

MALICIOUS

PDF

78.7 KB Created: 2021-04-25 18:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c2365c18b9f4270ee21ed04d97915887 SHA-1: 30d142cc44477e7aebde2c52528a5b8879e0a147 SHA-256: 397f250fec1a5c7c872217a43ebfca6bb06179b83c2af5f9860aedbf37f09618
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing lure.

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://resalured.ru/strik?utm_term=les+miserables+movie+ending+song PDF link annotation
    • http://sifisomatexow.sportsontheweb.net/jetapizi.pdfIn PDF document text
    • http://raftgjgr.space/aula_facil_inglesb0je3.pdfIn PDF document text
    • http://sayseedokg.com/alvida_mahe_ramzan_whatsapp_status_videoju3o6.pdfIn PDF document text
    • http://uscreditinquiry.info/lediramiximuz9t4d8.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/what_does_survival_of_the_fittest_really_mean.pdfIn PDF document text
    • http://apparently-home.com/white_christmas_lyrics_elvis47g19.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/interior_architecture_group_books_free_download.pdfIn PDF document text
    • http://foxinawolukomat.iblogger.org/kuvawul.pdfIn PDF document text
    • http://tb-films.ru/xagogonuzaxgb4oi.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/vufupu/kapulax.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_e599cdd11f3d4e30ae371ef865aa3a9b.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_463344e7615b4f1490688b524664e1fa.pdf?index=trueIn PDF document text
    • http://lekeviwa.onlinewebshop.net/vejusorejifawadasepaxoj.pdfIn PDF document text
    • http://lalemifeluruka.epizy.com/acknowledgement_of_a_report_example.pdfIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_1dda1bb03ab24e1a8bd0c6156718bf46.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_27be65ae739d46179e0dd970455d7a46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/north_kolkata_puja_guide_map.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_5fcbaf0088374c8cb7fc9bffd3a91e5d.pdf?index=trueIn PDF document text
    • https://dfabac9c-3a78-4d86-b112-ccf1750024e9.filesusr.com/ugd/b46e2f_b75b0b54412d4f4087a0d5cfcb829f83.pdf?index=trueIn 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_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 5284 bytes
SHA-256: 00419c6807f65bc1d1f7a6b500a53704f5ce2308f3db639050ab656b2c334d10
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 11440 bytes
SHA-256: 8d7270e3656548b7b18cd640f83a49be53f14d44a85c4a943c926f9b1a4be8b4

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