Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cf1d0b3ffed756…

MALICIOUS

PDF

40.9 KB Created: 2020-04-15 07:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eee18e2fc46c01daee23d60ff3abfe68 SHA-1: 9edae4cfb384b9e7a60ebd896e7886a1de834278 SHA-256: 25cf1d0b3ffed7567546fe3e9fac81b27ec0d6d88f02caec993e896cc353814e
94 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within it, primarily hosted on 'meganalvarado.com' and similar domains. The ML classifier strongly indicates maliciousness, and the presence of many external links suggests a redirection or phishing attempt. No scripts were extracted from this sample.

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://treasures4yourheart.com/uploads/1/3/0/4/130478772/130478772.html#informed+consent+meaning+in+research
    • http://meganalvarado.com/uploads/1/3/1/4/131437750/tutafumawapu.pdf
    • http://vppastoralco.com/uploads/1/3/0/3/130323424/xularudaku.pdf
    • http://heavenlyleiakina.net/uploads/1/3/0/5/130539843/303226.pdf
    • http://watchthebridge.net/uploads/1/3/0/5/130545199/kafajumumun.pdf
    • http://cpsmachine.com/uploads/1/3/0/8/130874299/meradoxididarir_zidutifeful.pdf
    • http://elmoshade.com/uploads/1/3/0/7/130776493/973e775ceacc2.pdf
    • http://mollyneves.com/uploads/1/3/0/4/130435551/d7f07977907.pdf
    • http://duvelier.net/uploads/1/3/1/4/131407552/givoparewexiwin.pdf
    • http://lindseyparkernovak.com/uploads/1/3/1/4/131409158/17ba048.pdf
    • http://protopgranite.com/uploads/1/3/1/0/131070469/govugagutodebo-rodorewiboxif-baton.pdf
    • http://wolfpackqbclub.org/uploads/1/3/0/4/130483703/luvesuxazo-remamu.pdf
    • http://downthenile.com/uploads/1/3/1/4/131438162/9895778.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_off00006670.bin
d2dfe5b40bed0e8ff751cf24725ed85d434a61a3fb45227dec2d7d788285f383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6670 7124 bytes
font_01_sfnt_off00008265.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8265 16036 bytes

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