Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd643ad4a12d86b…

MALICIOUS

PDF

71.2 KB Created: 2021-02-07 00:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5b29247735e1b9ced0bb2c2b5fddfb75 SHA-1: 94538bc6865edfb09d437b335c07e3a9d9e45cfa SHA-256: ffd643ad4a12d86b4537dbe05289875e85b0aeae8a9c0457f887af7418f56a84
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users through deceptive content.

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://bologen.ru/123?utm_term=music+box+repair+nyc PDF link annotation
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/4349867.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/art_of_glow7vzod.pdfIn PDF document text
    • http://xteenware.online/nissan_sentra_2002_manualsrc8h.pdfIn PDF document text
    • https://gevupowola.weebly.com/uploads/1/3/1/4/131483584/07df3a7dacfd3.pdfIn PDF document text
    • http://onlinesos.tech/bayesian_statistics_an_introduction_4th_editionudgfm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480744/normal_5fd876b051bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489264/normal_5fe7bc7c75a45.pdfIn PDF document text
    • http://verification-help.business/32580568437qd0ds.pdfIn PDF document text
    • https://dubobovutorikug.weebly.com/uploads/1/3/5/3/135332124/2892904.pdfIn PDF document text
    • http://losmopaka.site/1lioo.pdfIn PDF document text
    • http://handler-autoscout24.com/ejercicios_de_transporte_metodo_esquina_noroestexbf4i.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/2800933.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/gowupuzokowuxes/asbestos_ceiling_sheet.pdfIn PDF document text
    • http://wawutanow.epizy.com/report_aggressive_driving_virginia.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/97787387613.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/resusebelaxewaz.pdfIn PDF document text
    • http://lagarudu.epizy.com/checkpoint_appliance_4600_datasheet.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_off0000d908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD908 5212 bytes
SHA-256: af81c3f44c536682d38d151ef88e7c3538a181f5e497b6bc6ba336b3485e2cc9
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 10908 bytes
SHA-256: 8d9e71bb24b8c005285b1b7db01b4f2768b8ed5ddeab9ff3997dedcbfafde1a7

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