Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc5fee7487e75e7…

MALICIOUS

PDF

34.2 KB Created: 2020-06-05 06:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25264342ed25d8911c86e32a839e070e SHA-1: 82e1076d9055d863b3eafc6eb8e82096ef2e068e SHA-256: 0dc5fee7487e75e7840a9db7e42b5ba83d2ab9c0f3691e0a4b1c20be63ce4199
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, http://studenics.net/uploads/1/3/1/4/131483632/131483632.html#makai+moon+guide, is part of this link farm. While no scripts were explicitly extracted, the nature of the link farm suggests a potential attempt to manipulate search engine results or distribute malicious content via these external links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://studenics.net/uploads/1/3/1/4/131483632/131483632.html#makai+moon+guide
    • http://thebigfrack.com/uploads/1/3/0/5/130550782/7362914.pdf
    • http://davyjonesfishing.com/uploads/1/3/1/4/131452808/59c4ed2dd20b.pdf
    • http://pradindustries.com/uploads/1/3/0/6/130620931/pajaponali-jibusis.pdf
    • http://jenesis.info/uploads/1/3/0/7/130775623/jojatowejor.pdf
    • http://smarttvnow.com/uploads/1/3/0/8/130814909/lajivupi_nuvedegojijijow.pdf
    • http://agreenercanada.com/uploads/1/3/1/4/131437722/4095417.pdf
    • http://contextconsultants.co.uk/uploads/1/3/0/6/130639840/vumik_taliziv_ledesimokon.pdf
    • http://themombasket.com/uploads/1/3/0/6/130620584/nuxalajinubapuf.pdf
    • http://lasna.org/uploads/1/3/0/4/130476502/lilalesaka.pdf
    • http://glasspictureproductions.com/uploads/1/3/1/4/131438217/podiwidegowugupuzi.pdf
    • http://davestudiorama.com/uploads/1/3/0/3/130313286/4340299.pdf
    • http://bcgcollective.com/uploads/1/3/0/7/130776103/289ae.pdf
    • http://studenics.net/uploads/1/3/1/4/131483632/terms.html
    • http://studenics.net/uploads/1/3/1/4/131483632/dmca.html
    • http://studenics.net/uploads/1/3/1/4/131483632/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vitosomuzete.files.wordpress.com/2020/06/tilokedaw.pdf
    • https://dukakala.files.wordpress.com/2020/06/85810316579.pdf
    • https://tukitifo.files.wordpress.com/2020/06/29809350830.pdf
    • https://bokifib.files.wordpress.com/2020/06/97412595187.pdf
    • https://pibawiwuruxo.files.wordpress.com/2020/06/jumavepej.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058ed.bin
6a0471db7bbd99e1e14e1cc3f6f5a416de339abaaa3c60be81fee731eb486a40
pdf-font-stream PDF embedded font (sfnt) at offset 0x58ED 10344 bytes