Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc2e71f68d634ba…

MALICIOUS

PDF

78.2 KB Created: 2020-11-25 16:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32785e766c291d53ea9cd0497b845f7 SHA-1: f91ae9a4e9f8bce9ce7d039253793426e4784795 SHA-256: 1cc2e71f68d634baa8d1d8da669e73a39267466975f3b2970850da64f8e8cbff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to other PDF files hosted on various disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure suggests a malicious intent to manipulate search engine results or distribute further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/aws?utm_term=wrestlemania+27+bleacher+report
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/9944119.pdf
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/a376ee.pdf
    • https://cdn-cms.f-static.net/uploads/4475863/normal_5fa6f3848c1e5.pdf
    • https://vagipirisixo.weebly.com/uploads/1/3/4/8/134861957/wixipapu.pdf
    • https://surafevigenirax.weebly.com/uploads/1/3/4/6/134610600/ladopeminizokew.pdf
    • https://disadoxamegipu.weebly.com/uploads/1/3/4/5/134527150/3751123.pdf
    • https://mepefukuwipo.weebly.com/uploads/1/3/4/5/134523025/43d40.pdf
    • https://gosegedad.weebly.com/uploads/1/3/4/1/134109039/fewobudedunezug-vidagajawumep-vemavim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/29e114e9-5890-47d2-a8af-11e1e13225c5/muwiv.pdf
    • https://s3.amazonaws.com/muwemivumazulax/27086155548.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c7.bin
2dbc09f27979128fb9097057bedbe16a28d577863d382af388a3920bc07f6f42
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 5536 bytes
font_01_sfnt_off0001097b.bin
77ef8ccf936b0c4e19479f5d80d7181b85791cb7454b69d24cc268b45c4ed9e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 10104 bytes