Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf9d3816eee1d02…

MALICIOUS

PDF

83.5 KB Created: 2021-06-03 12:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9e6b15137a7a0f6585a0bf2faa3c027 SHA-1: 7350cbaa8595a32682e48dbcbddf778cfac00b5c SHA-256: baf9d3816eee1d02d0d4ce30ed7d44dd73297d365e56f7c565e8cbe6d3a4e7f7
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 0.9998

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://ketchas.ru/pbw?utm_term=how+to+fill+out+cms-1500+form+for+medicare PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fd99fc824144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_603935bc2199c.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/kixemit_nimizopipipafud_soviles.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/4212560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427538/normal_5fe48f5ad5257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_601b2eb40dcdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_606351833a2b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490138/normal_60699e7ed9999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_602ab2b208b33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486201/normal_6000d28676844.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4483083/normal_60b4be897c48e.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/73436eef-2ef2-4e31-9fdb-fbb86cdeae00/peluvifutewax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29def8d5-bde2-40c3-a081-a7d35ff9d147/zukemen.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144517494/logotakesuwoxaroza.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144436203/57081083820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d75f82de-8995-4fbb-8ef1-ce8eb60326b1/extraction_of_piperine_from_black_pepper_lab_report.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_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 5568 bytes
SHA-256: fbbbc2bd5f0b59f3fd24ebca59843e65f6b78ea910c4c7db79ef97f7c099dfd4
font_01_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 11204 bytes
SHA-256: da6509e2758e593ccad816bda677fe9e5f7340725161402beaaa8b84e2fca79c

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