Malicious PDF — malware analysis report

Static analysis result for SHA-256 986433cb9da33487…

MALICIOUS

PDF

80.1 KB Created: 2021-06-05 09:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 417b94ceee5f0529d9fda851129c5343 SHA-1: dc7406705b546e455843976e81ed3b68c91256ca SHA-256: 986433cb9da334876208022165bd78eb89ed07fcd6e132aded691f99109b2f43
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a link farm designed to redirect users to external sites, with one specific URL identified as a potential phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=how+to+take+early+pregnancy+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388432/normal_604206c77b6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_60160611c3394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_604f8e183cec2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_6005ad2a63c67.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4458421/normal_60afe84393335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_6031e748d9e6a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416128/normal_60b715f7795d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403541/normal_5fe8b579e3f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503791/normal_606e29e63dfea.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/db678e4f-acfd-4e95-a7e9-b52306d5e392/my_cordless_dyson_head_not_spinning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672184b5-4006-486a-baf7-7639a71dda92/song_of_solomon_2_3_commentary.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/f/integrales_por_fracciones_parciales_caso_1_ejemplos.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144442905/como_eliminar_cuenta_google_de_hisense_f23.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/descargar_abbyy_finereader_15_full_espaol_gratis_con_crack.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144483360/zesekidovoxid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69c1c7e-7641-4b63-b980-8ad537f75fd9/sig_sauer_p320_compact_vs_p365xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adfd390-ffae-4378-87a9-1d5471839365/vetuvexe.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/w/file/fetch/144441192/daxeteximowudi.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_off0000fcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 5320 bytes
SHA-256: db57ab029c073558ce3c6c4ec58702ee6b482b4eacb0774a5df7ca311a9dbfd2
font_01_sfnt_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 10376 bytes
SHA-256: aac065899e84a9ac92c904a2521f16f084b1facc6fd21d61e600a73e6f4839f1

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