Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be2921bde4f3f87…

MALICIOUS

PDF

78.3 KB Created: 2021-02-25 17:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cf457be2a5b1cb88c3872ca2f43f6a7e SHA-1: 9349f7037f729e7a76aeeae1c8d34af3a8073256 SHA-256: 1be2921bde4f3f877c5c068b96dc3c1a8a826abc9e21aa719b652cd3e5651da5
166 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that is likely part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into divulging sensitive financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://seumenha.ru/award?keyword=how+did+the+lake+house+work PDF link annotation
    • http://kitafoged.medianewsonline.com/nerapofisir.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/how_to_make_a_claw_machine_out_of_paper.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/xogametanudorixinufob.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/6533392.pdfIn PDF document text
    • http://giocodigital.website/vipokunevubonoj2zd4.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/2739810.pdfIn PDF document text
    • https://bexudedumazises.weebly.com/uploads/1/3/1/4/131406785/jitulomejavixax.pdfIn PDF document text
    • http://katipef.medianewsonline.com/what_does_a_team_lead_do_at_walmart.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/tujes_wuwufaxuwa_xadovalob.pdfIn PDF document text
    • http://netewe5.xyz/fofinasozarescr5p.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/powag.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/dazemi/numinoxunivanonuna.pdfIn PDF document text
    • http://sajulugebimisu.myartsonline.com/42976536106.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/molalidad_disolucion_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/69969302674.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_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 5032 bytes
SHA-256: ccd2f08b4efca01a536cd19b798a4c6616a6b46b5277f6909409a74116d32b62
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 9836 bytes
SHA-256: 8ab74fbd9111d7881dd9efea07f3224068436cfa10989f9a0b553923b543d079

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