Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f0eb240e16c3a7…

MALICIOUS

PDF

41.2 KB Created: 2020-03-29 21:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b7a243c2cb2857b1a9c8d6d1aeb95bd SHA-1: be33bd99da423d8aa66968f7a1291e57a8a6458f SHA-256: 30f0eb240e16c3a76cb962b4b2244cf3211a4ec2155df14fbddc95d9a93b1a39
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, a technique often used for SEO link farming or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool that can be used to create PDFs from web content, further supporting the link farm hypothesis.

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://mhrandlenovels.com/uploads/1/3/1/3/131379718/131379718.html#esquema+de+mayor+contabilidad+concepto
    • http://bhombproof.com/uploads/1/3/0/5/130588651/cf44b4da1.pdf
    • http://intelroom.net/uploads/1/3/0/6/130605248/6178754.pdf
    • http://naturesbeautysc.com/uploads/1/3/0/6/130621707/dogutaf_bolopediguli_sizab_mifazaviwolamo.pdf
    • http://rubiksproperty.com/uploads/1/3/0/6/130639926/roxakobetub_wavuko_leriwezaki_fagunulez.pdf
    • http://3mtrucklines.com/uploads/1/3/0/6/130604024/b6d11e69dd72b52.pdf
    • http://kidskornerboutique.net/uploads/1/3/0/8/130813877/xujiduxunexivu_pasirikagalemuz_venunopi.pdf
    • http://scbhcjubianjam.org/uploads/1/3/0/7/130775742/1766919.pdf
    • http://overletop.com/uploads/1/3/0/8/130813931/rewevegekomuruw.pdf
    • http://ossirising.com/uploads/1/3/0/4/130483806/nojawowatar-dimez-nawuxedizawepo.pdf
    • http://texashelicopterhoghunting.com/uploads/1/3/0/6/130620811/2655652.pdf
    • http://12holmes.com/uploads/1/3/1/3/131398066/barogevosanusip.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006df0.bin
fb3948447d01a19ab55def74254f8b2dbb481ca007b40f8cac9f48623c962e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF0 8572 bytes
font_01_sfnt_off00008d3b.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3B 1708 bytes

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