Malicious PDF — malware analysis report

Static analysis result for SHA-256 e360059e8a1e5bd5…

MALICIOUS

PDF

51.5 KB Created: 2020-04-13 01:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e69d215655bd03177e9e47329a1611a4 SHA-1: a514b2b7fe41f240995ae7bc7582c2b85a9fb151 SHA-256: e360059e8a1e5bd57f26e9bd73bfdbaf228d1e8a1d0a13e1751506e92be2a942
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDFs hosted on various domains, indicating a link farm or SEO abuse pattern. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'Ensayo sobre aprendizaje y desarrollo humano' and wkhtmltopdf metadata, suggesting a lure document. No scripts were extracted, but the extensive link farm points to a malicious intent to redirect users or host further malicious content.

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://prbymal.com/uploads/1/3/0/5/130547207/130547207.html#ensayo+sobre+aprendizaje+y+desarrollo+humano
    • http://grandblancmusic.com/uploads/1/3/0/3/130379075/kugub.pdf
    • http://embodiedcarbon.com/uploads/1/3/0/5/130538994/6211089.pdf
    • http://cathaircreations.com/uploads/1/3/0/7/130775518/bixewipor-tojijonake-gisute-wulawekibabi.pdf
    • http://movinfast.net/uploads/1/3/0/9/130969768/powimadedegubisekan.pdf
    • http://fitindie.com/uploads/1/3/0/5/130547275/xowan.pdf
    • http://wfhhustle.com/uploads/1/3/0/6/130639779/440657.pdf
    • http://cdconggiaovietnamvic.org/uploads/1/3/0/8/130813782/1236168.pdf
    • http://fromfarmandforest.com/uploads/1/3/1/3/131380470/3488966.pdf
    • http://cephotos.net/uploads/1/3/1/6/131606347/tuzivo-sokoxifigimu-duron-foxezaxadir.pdf
    • http://klaypotz.com/uploads/1/3/0/6/130621906/1047281.pdf
    • http://comparehousebuyers.net/uploads/1/3/0/3/130379133/xepalud-fefumewazoxur.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009c55.bin
4053e2ab28cd0eba5f745139a888b0e538a909d80ad25689b561100621092899		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C55 10136 bytes

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