Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bf3e2e116ca77e…

MALICIOUS

PDF

37.4 KB Created: 2020-06-01 23:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 323f860a35e652efc31e0d038b321008 SHA-1: 3817a8fbe83ebf351e3f4584b9eeb882c569de8d SHA-256: 39bf3e2e116ca77e92b82c0cf8519abe831a8bff187662020134f4cdc895aec6
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list, reinforcing the link farm attack pattern. No scripts were extracted from this sample.

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://s9kfv.slpny.com/uploads/1/3/0/6/130605273/130605273.html#polar+express+kid+meme
    • http://mta-sts.mx.jwardcontractors.com/uploads/1/3/0/5/130589031/fe530.pdf
    • http://admin.jakdempseydesign.co.uk/uploads/1/3/0/6/130639259/gozemegagax_xajeka.pdf
    • http://tec-commodities.org/uploads/1/3/0/9/130969186/wufojudat.pdf
    • http://kbesthetics.com/uploads/1/3/0/6/130621524/39f8c.pdf
    • http://cnordic.is/uploads/1/3/1/4/131407445/tifegag_muvesuw.pdf
    • http://kman-turbo.de/uploads/1/3/0/4/130490421/7818510.pdf
    • http://coronaaction.org/uploads/1/3/1/3/131378968/3110966.pdf
    • http://s9kfv.slpny.com/uploads/1/3/0/6/130605273/terms.html
    • http://s9kfv.slpny.com/uploads/1/3/0/6/130605273/dmca.html
    • http://s9kfv.slpny.com/uploads/1/3/0/6/130605273/policy.html
    • https://ladareguk.files.wordpress.com/2020/05/penajunamimuxovetik.pdf
    • https://jubowut.files.wordpress.com/2020/05/48954958590.pdf
    • https://wadedib.files.wordpress.com/2020/05/83682163383.pdf
    • https://xebepevixi.files.wordpress.com/2020/05/gubotigoxugifetalatigozi.pdf
    • https://gavajuw.files.wordpress.com/2020/05/zosulolodove.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_off000066f7.bin
49450f08ca3ade52fb8d40c5059c78aef80d549d848c8d20c370478876e8f439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F7 10396 bytes

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