Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a51dacfe59c1ec…

MALICIOUS

PDF

38.3 KB Created: 2020-04-04 08:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e9083b98f3fd34e003e1f4a64108c8f SHA-1: 1898ffe436f88e3e7a69921acf5a0c382acc417a SHA-256: d3a51dacfe59c1ec4a0de24bd90dab95d032becfee85b181d35dbd15e23ca2ea
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and what appears to be metadata from the PDF generation tool, but the primary malicious activity is the distribution of numerous external links, likely to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://platonschool.org/uploads/1/3/0/7/130739175/130739175.html#dosificacion+concreto+fc+100
    • http://thequiltingstash.com/uploads/1/3/0/6/130603884/becc12fe17.pdf
    • http://listingphototour.com/uploads/1/3/0/2/130291555/362dcd27.pdf
    • http://coalesceindustries.com/uploads/1/3/0/4/130435622/pevosufuxidas.pdf
    • http://surefoundationfellowship.org/uploads/1/3/0/2/130289620/desef-sifugoxabej-vemoduwolub-wibolikakipe.pdf
    • http://financial-plan.services/uploads/1/3/0/7/130775828/7864370.pdf
    • http://www.sadalaorphanage.org/uploads/1/3/0/9/130968942/dorivibopun_suwegizazepob_safozolemojefa_tavak.pdf
    • http://assumptaleesteere.com/uploads/1/3/0/9/130969166/632e80ed51b4fea.pdf
    • http://www.honourdignitycoalition.org/uploads/1/3/1/4/131438397/pupoxob.pdf
    • http://shellsspace.com/uploads/1/3/0/5/130589308/fivox_sarated_posipix.pdf
    • http://gunmodder.com/uploads/1/3/0/7/130739907/5470411.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_off00006ac2.bin
fe492f87a41370b4fdfba9a2f38b7ae71e18393a7ccffc2ffb2022847d8ab6bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC2 8796 bytes

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