Malicious PDF — malware analysis report

Static analysis result for SHA-256 401e155026d9ed2a…

MALICIOUS

PDF

33.1 KB Created: 2020-04-04 06:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d4fff29c60df34aa0e60272de8623d93 SHA-1: 39aac0404908627c12df7acfe70c005d36470807 SHA-256: 401e155026d9ed2a2e8bba0afbbe41a8402755e990f1ea4c2763a774ead1af39
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm operation, likely intended to manipulate search engine rankings or to serve as a distribution point for further malicious content hosted on the linked domains.

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://fashionbx.com/uploads/1/3/0/7/130739975/130739975.html#usa+water+polo+odp+national+championship+2020
    • http://alliedhealthcareinstitute.com/uploads/1/3/0/2/130291712/a3282fd9bec7.pdf
    • http://detoxingkids.com/uploads/1/3/0/8/130873954/0bfee8d14c8b.pdf
    • http://c5events.ca/uploads/1/3/0/2/130270899/93fe4f7a1922.pdf
    • http://poesyfloralstudio.com/uploads/1/3/0/7/130738740/2267910.pdf
    • http://mserinmarie.com/uploads/1/3/0/3/130313140/5774268.pdf
    • http://hoactrainer.com/uploads/1/3/0/8/130874378/9539224.pdf
    • http://www.dazzlingbella.co.nz/uploads/1/3/0/2/130272582/3403249.pdf
    • http://fwi-traduction.com/uploads/1/3/0/6/130603692/wagexilipitupamu.pdf
    • http://thebucketclub.net/uploads/1/3/1/4/131438775/3484465.pdf
    • http://maturantskeobleke.com/uploads/1/3/0/3/130323892/vusowasolugi_zoxuli_vuron.pdf
    • http://madmacarons.com/uploads/1/3/0/6/130605384/e06b87f0e6a5ceb.pdf
    • http://figure8energyteam.com/uploads/1/3/0/7/130739879/11d3ac8a3fb15d4.pdf
    • http://samuelpluck.com/uploads/1/3/1/3/131398264/raxesivagajaxomej.pdf
    • http://leyendecker-landscape.com/uploads/1/3/0/8/130874026/63fbd9.pdf
    • http://rufus.pdp.fi/uploads/1/3/0/2/130287243/pofarewowil.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_off000058a8.bin
1a4a0098d2f7a668368227e2c9891a57d1fa5f711187d632f8716de82f1c1918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A8 7828 bytes

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