Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db6b2ea3a44a56b…

MALICIOUS

PDF

74.0 KB Created: 2021-03-13 12:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e1ba522a93fa14173a4c62771d360c64 SHA-1: 9c7c13113b52527fc312462f66b69f2b722ac4f2 SHA-256: 8db6b2ea3a44a56b674ac3c6dfc43dd27481665477176561a035311f23b2f413
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://resalured.ru/strik?utm_term=how+do+i+troubleshoot+my+modem PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413000/normal_602338857a241.pdfIn PDF document text
    • http://shoppingyxplus.xyz/mucocutaneous_candidiasisu9bvp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5ff227bf382cd.pdfIn PDF document text
    • https://gotivewa.weebly.com/uploads/1/3/1/0/131070711/9554342.pdfIn PDF document text
    • http://btsworld.org/fukawowetorez9zk1m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_6032b1142221d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_6019bb8195edf.pdfIn PDF document text
    • http://forkidsshop.online/youtube_photoshop_cs6_tutorials_deutschz9o85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_600adb0ee30c8.pdfIn PDF document text
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/5541181.pdfIn PDF document text
    • http://stavki-na-sport.site/glitch_vhs_camera_appw2ad3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465694/normal_5ff3a63e0d3ed.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/risisipajole/how_a_cool_mist_humidifier_works.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/extrato_de_barbatimo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/fupusesupanep.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_bf5123db5dfc4e51b6457d6419185ae4.pdf?index=trueIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_e08f18a88af94c44b2611ba5bd0bc2ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/cissp_8_domains.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_e0d07b20a6b94df5be76fdd753b9eb20.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_0391283fc34a44bca153867e4d118c9a.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_a2de8229f9e44d189b5894bac5e4b3db.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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 5148 bytes
SHA-256: caec232889a1cc1a77276c88a02bf12bae307c5b48b7c328d8ea3363ee130005
font_01_sfnt_off0000f8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A0 10020 bytes
SHA-256: 38286655e777097a267bda304b8af56602e7c8ac2aec71acef066c04f60dc951

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