Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c7f982355f9d38…

MALICIOUS

PDF

77.0 KB Created: 2021-06-01 12:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8ac40750e4473c8ae9093eaa0bf74441 SHA-1: 4b54e1e04d2fd0093fca7d2869f3dd2fd49b53c6 SHA-256: 55c7f982355f9d3819ce78cf2b2a3213569265c7402773336e2aa4cb866651a2
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 0.9996

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://kuzutuzo.ru/123?utm_term=o+level+maths+vectors+notes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472481/normal_604145fd7bf3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_6053377e22070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460963/normal_6033fb2193957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_60241cd1bfd86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457272/normal_5ffd2846d8c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5fd26299076c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_604aaacc51d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_6027eb5390667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fdc4bb0b4c09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375885/normal_5fcc62c835c4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_5fe613d08ea7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcf97156331e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_601b32385b9b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_606576cc30f61.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/8858446c-08ea-4613-94a3-9788dff0af8b/56320254806.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/80883574407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c0a0e7-acdd-48a9-a321-489faee15527/pupugexasasofiligenub.pdfIn PDF document text
    • http://gosirata.pbworks.com/w/file/fetch/144455823/pupir.pdfIn PDF document text
    • http://kalunagepigi.pbworks.com/w/file/fetch/144424902/bawanuvi.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144420828/planeta_dos_macacos_o_confronto_assistir_online.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/78144591051.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA4 5480 bytes
SHA-256: 32e26b8a91d2705404a7d346c5ea9384fcc9b982765a3215e0cdf9a05f0e6363
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 10864 bytes
SHA-256: 82e18e6ef017209232bad270db4cc0df64b18baa24e41dfe6e2b8e2e96fbba39

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