Malicious PDF — malware analysis report

Static analysis result for SHA-256 a229df9ce03485f4…

MALICIOUS

PDF

38.3 KB Created: 2020-04-08 01:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d04a2c9d602141f7db10cf78ea0fe759 SHA-1: 93265669e9fbc1b61d93bad62eacbdd19700311c SHA-256: a229df9ce03485f453e58183578d2ffa8be857a89d6b423e1f98753f48e22731
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary purpose appears to be directing users to a multitude of PDF files hosted on various domains, potentially for SEO spam or to distribute malicious payloads. No scripts were extracted from this sample, and the document body is heavily obfuscated.

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://meandmecosmetics.com/uploads/1/3/0/5/130545334/130545334.html#student+profile+template
    • http://cct-i.com/uploads/1/3/1/0/131070866/4097709.pdf
    • http://jamesorourkelaw.com/uploads/1/3/0/6/130620475/magawov.pdf
    • http://learningthroughyearning.com/uploads/1/3/0/6/130621327/5977765.pdf
    • http://hvotp.com/uploads/1/3/0/9/130969693/5068280.pdf
    • http://alvarezorganicfarms.org/uploads/1/3/0/8/130813896/6f3e015b.pdf
    • http://clinton4president2019.com/uploads/1/3/0/4/130435892/xatozebaxon.pdf
    • http://contigodesdeelcorazonmx.com/uploads/1/3/0/6/130620793/d30e81cee361.pdf
    • http://ordinariatesouthmanchester.com/uploads/1/3/0/8/130814346/mibukunixoga-tibusos-nusuromuzel.pdf
    • http://sno-ops.org/uploads/1/3/0/7/130775685/4c6c29cfc71f25.pdf
    • http://premierbeachpropertymanagement.com/uploads/1/3/0/8/130814774/4481782.pdf
    • http://appleshaw.net/uploads/1/3/1/1/131164557/rejizepul_medil_zozusebof.pdf
    • http://ivfv2.com/uploads/1/3/0/3/130313346/vuwotoserixulex_wivafasipe_fepeziso.pdf
    • http://stepstonerealestateinvesting.com/uploads/1/3/0/2/130292007/mebibomububeba-popiwaxunemure.pdf
    • http://majesticwealth.net/uploads/1/3/0/6/130604427/8736816.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_off00006d81.bin
f6e4e0d78df8726fa8c8c828958b422b0c447e73a8a8ca25daf019644a72c79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D81 7916 bytes

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