Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad34b6a710aa462c…

MALICIOUS

PDF

72.0 KB Created: 2021-03-17 16:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ebefb722637874e515ffe2e78aba61c2 SHA-1: b31e5ed9fa78f5b6f0ee98c599c12a66ccfb2472 SHA-256: ad34b6a710aa462cedd8807bfda7f75945b04f50858e0f43184f8a78be42d57d
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 0.9997

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://nipisod.ru/award?keyword=ashrae+standard+62+1989+pdf PDF link annotation
    • https://dulebolipema.weebly.com/uploads/1/3/5/9/135997598/644f7.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/what_is_the_newest_ps_vita.pdfIn PDF document text
    • https://sijivijotulexe.weebly.com/uploads/1/3/1/1/131164009/fumurazeroganag.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/punajezepisoweku.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/visuwa-vepumejawuwof.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/how_long_is_a_medical_assistant_certificate_good_for.pdfIn PDF document text
    • http://birixuxewazotaz.mywebcommunity.org/8051_architecture_and_pin_diagram.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/affairscloud_capsule.pdfIn PDF document text
    • https://dejegudiferu.weebly.com/uploads/1/3/1/8/131857494/9aa7712990.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/8393877f-c6ab-4dc8-812f-0801b80fa1ca/72758004696.pdfIn PDF document text
    • http://molujafit.atwebpages.com/doctor_sleep_movie_review.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_ddcb9882f3ed47b589e8dcea793e1869.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f17df2-d9f1-424d-8864-699cab609128/41718419533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6be9ff-e734-4f22-b3eb-291699668e1a/fajoxesakopurawalogada.pdfIn PDF document text
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_b965d37ce6fa4c1f8bb72ac70c3814af.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_9371c3284c8844179564567e3c9477d8.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_29a35f1bb3ac4192aa00d103c057cb9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e06e74-1e89-4556-aa08-de9329cb2b6b/que_es_aprendizaje_basado_en_proyectos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d62c7ffb-e101-42d9-a004-a2629c6924df/spalding_basketball_hoop_spare_parts.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_c05cc657b924471f9f4e01713e8559f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4379b1a4-0c18-4c50-8e95-2bbe35fc9d1e/public_administration_meaning_in_hindi.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_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 5776 bytes
SHA-256: 511c6c36ed7364bd54d9bff2d25cb72a3e8a26e383a81e06da5878893c9627e5
font_01_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 11528 bytes
SHA-256: 828d5084b14e3b4ad09c0214e51acb0e87423e0d27092ff18a191b3396eae537

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